Limestone deposits act as sand magnets, and they end up creating clumps of sand that decrease the efficiency of your filter.
If you are wondering 'how much sand do I need', our free sand calculator is here to do the math for you. The multiport design is usually installed on the side of the tank, with an inlet and outlet union made out of plastic.
On GIGA Calculators sand calculator, note whether your pool area is rectangular or circular and write in the dimensions. WebSee how much you can save with our other pool product calculators. Because different types of sands have different uses, it is critical to select the right size. The sand's water content is moderate. WebDetermine if it is really sand by brushing it with a pool brush. Now that you know the amount of water your swimming pool can hold, you can now move to the next step of calculating the minimum flow rate required from your pool filter. Mason Sand (Pool Sand) Price: $42.00 per yard + tax & delivery. One way to minimize spills is to buy small, single-use bags of DE instead of a big one that might last a whole season or longer.
But, you dont have to open the tank to access the sand.
Example: The rectangular surface having length 12ft, width 14ft with a depth of 3ft. Sand usually comes in bags that weigh between 50 lbs. Concrete sand, due to the high demand in concrete construction, is also highly sought-after. If you add it to the skimmers mouth too quickly, some will fall to the bottom of your pool, and youll need to vacuum it out. If you divide the mass of sand by its density, you obtain the volume that the amount of sand occupies. I work with HomeAdvisor to match you with the best swimming pool contractors in your area. You can even figure out how much the sand will cost you using the calculator if you know its price per tonjust add that right in, too. It's determined by its size and intended purpose. From our residential and commercial water solutions, to industrial water management and everything in between, Pentair is focused on smart, sustainable water solutions that help our planet and people thrive. That gasket can be easily damaged, even during routine valve position changes.
This number is used in the calculator to indicate that the sand is moderately damp.
The sand calculator allows you to calculate the amount of sand for making the base of the pool so that you may be able to build the pool safely.
If you're planning to plant a garden this season and you're wondering how much topsoil you'll need, our topsoil calculator can give you an estimate in the format you prefer. Old pool filter sand is actually a bit dangerous. Information
This is just half the distance from one side of the pool to the other. Ordinary beach sand or playground sand wont do because those have sharp pieces of rock, so choosing the correct kind of sand is essential. If you divide the pool capacity with the turnover rate in hours, you get a minimum flow rate in gallons per hour. "river sand" (also known as "builder's and" ("sharp sand"), "grit sand", concrete sand"), "masonry Sand", "M-10 sand") (granite sand), and "play sand") are all finer and more costly than the others. This way, if you ever need to take something apart to access the system, you dont have to cut any pipes.
The water then collects in and rises through the center pipe. Concrete mixing, construction, and other uses. This technique can help you avoid over-tightening and cracks.
Sand is a fine material that creates a smooth bottom for your pool.
Concrete is made up mainly of sand. For smaller pools, it makes more sense to simply buy the sand in bags from your local hardware store. For pools requiring a third visit additional fees apply. There are three main types of pool filter sand: zeolite, pool filter sand, and filter glass.
While it is possible to put a pool on a concrete slab, its not recommended. The volume of the pool is important to calculate for this.
Ensure your tank is level and you follow the manufacturers recommendation for adding sand and the pipe size you use for your plumbing. Once you have all these measures, use the following formula: Volume = length x width x depth b) With two depths Unlike most above-ground pools build with uniform depths, your swimming pool might have shallow and
Pool owners can save up to 90% when switching to one of our variable speed pumps. To calculate the volume of sand needed, use the following formulas.
Multiply area and depth to get the volume. We do our best at the time of opening to clean and brush pool, but we cannot be responsible for turbid water and suspended debris. For Round Pools Area = r2 h Where r = radius and h = height i.e. You can even figure out how much the sand will cost you using the calculator if you know its price per tonjust add that right in, too. For pools requiring a third visit additional fees apply. Winterizing an Above-Ground Pool in New England.
Michael has over 30 years of experience in the swimming pool industry. WebThe sand calculator helps you to determine the volume & weight of sand needed for the construction project.
If the pool filter flow rate is lower than your pumps, pressure will build upon the pump side and burst the pipes or even damage the unit.
Multiports also include a special gasket (called a spider gasket) that allows them to work. Of course, if you decide to use some unusual material, feel free to change the value!
New England winters are no longer as cold and snowy as they were a few decades ago, and I am not talking about the unusual snowfalls in October. They are relatively simple to operate, and they use a natural media, sand, to filter the water of fine debris. Diagram: A) Pressure gauge, B) Air relief valve, C) Air relief tube, D) Diffuser, E) Lateral assembly. Mason Sand (Pool Sand) Price: $42.00 per yard + tax & delivery. Both mason sand and concrete sand are the perfect size and consistency for your pool. Sand filters are easy to operate and the filter media is relatively inexpensive, but routine backwashing is required and replacing the sand is very labor-intensive. Other times, the multiport is actually on the top of the tank. This roof pitch calculator allows you to quickly calculate thepitch on your roof. There are chemical additives you can purchase that will help mitigate the risks of limescale.
When considering a sand filter, you need to consider the size of your pool to ensure you have enough sand to handle the amount of water youll be putting through it. WebMaterial Calculator. You can always wear a mask to minimize any health risks. Use the pipe volume calculator to find the volume of a pipe and how much the liquid inside it weighs.
This sand is fine and free of sharp rocks and gravel. The volume of the pool is important to calculate for this. This is usually created by shellfish and coral. Check out 31 similar construction materials calculators . Use the pool volume and a standard depth of 2 inches to estimate the yards of sand needed for your project.
With just a few measurements, Pool Calculator can provide pool owners with the information they need to balance
Whether you need a remodel, a new pool, or just some maintenance help, HomeAdvisor will find the best professional for the job. Measure the depth of your pool in feet. Salinity Calculator
It can also fill holes in your lawn before adding topsoil. 27 = 2.8 cubic yards (2.14 cu m). Some manufacturers may use other methods to indicate the grade or type of the sand, e.g. Its very easy to crack. Area = 3.14 r2 h For Rectangular Pools
The table below gives you estimates of how to size your swimming pool filter and pumps. Since they are very common, you should be able to get parts without too much difficulty when needed.
Hiring the best local pool installer helps ensure the success of your project. The density of sand is 100lb/ft 3 .Then how much sand do I need for the construction? The calculator will then display the total cost of the sand you need.
A slide valve is a simpler design compared to a multiport. Use the pool volume and a standard depth of 2 inches to estimate the yards of sand needed for your project.
WebHere is a table showing the amount of sand that should be poured in each sand filter size. WebDetermine if it is really sand by brushing it with a pool brush. The foam pool cove is 3-3/4 inches high and must be installed on top of 3 inches of sand. WebSee how much you can save with our other pool product calculators. Everything You Should Know About Total Dynamic Head.
WebShock pool, up to 4 gallons liquid chlorine. Filter system start-up.
Example: A contractor is putting in a round pool with a 20 foot wide diameter, the base material that is needed should be 8 inches deep (see Depth Key Code ). Calculate the volume of water in your pool. Use the pool volume and a standard depth of 2 inches to estimate the yards of sand needed for your project.
This is a tool that helps you estimate how much sand you need to fill a given space. Very old sand filters might have a metal pipe, but that is pretty rare to see. Safety concerns aside, making a mess with DE is quite easy.
This sand base calculator helps you figure out how much sand you need to create this base.
The multiport usually has a sight glass so you can see the water discharged during a backwash. Sand filters have pros and cons associated with them. Copyright 2019 The Pool Factory, Inc. All rights reserved.
I love to share my experiences with people & hope you are enjoying my information and lessons! The different types include concrete sand, yellow mason and white sand.
The pipe extends from the diffuser neck at the top of the filter tank down to the bottom, entering a manifold or hub. A cubic yard weighs on average around 2700 lbs or 1.35 tons. Shallow end depth + deep end depth / 2 = average depth. So, dont be tempted to use it for toys or litter boxes. For a round pool base, start by calculating the pools radius in feet.
Above ground pools need a sand base to protect the liner and provide an even foundation. We do our best at the time of opening to clean and brush pool, but we cannot be responsible for turbid water and suspended debris. WebShock pool, up to 4 gallons liquid chlorine. Volume = length x width x average depth x 7.5. Well talk a bit more about what sand is best to use a bit later. Relatively inexpensive filter media (sand), Common design familiar to most pool professionals, Sand is very heavy, and replacing it is labor-intensive, Access to the system for repairs can be difficult, The pool water remains cloudy even after running the filter as usual, Sand accumulates under the return jets in your pool, You need to increase filter run time to keep the water clear, Algae seems to occur more than expected despite keeping up with your water treatments.
If your pool pump flow rate is 20GPM, your pool filter must have a higher flow rate than this. Installing a sand filter is pretty much just like installing any other filter.
Otherwise, use these simple formulas when calculating the volume of a swimming pool: Rectangular pool: length x width x average depth = pool volumeCircular pool: radius x radius x 3.14 (pi) x average depth = pool volume Oval pool: length x width x 3.14 (pi) x average depth = pool volume The sand filters the water of fine debris, as it is packed inside the tank and around the internal plumbing.
Multiport valves can cost a few hundred dollars, and plumbing them into a system can be a little bit complicated, especially for a DIYer or a novice. WebHere is a table showing the amount of sand that should be poured in each sand filter size. A multiport can have settings for filter, backwash, rinse, closed, waste, and more. However, some kinds of sand may be too fine, so its important to go for something in the middle. Affiliate Disclosure: We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn commissions by linking to Amazon.com and affiliated sites. The first is the one that is used worldwide and is equal to 1000kg by the international body for standardization.
When the pump is activated and the valve is in filter mode, it forces pressurized water into the tank from the top or side.
Its also known as masonry sand or mortar sand. This means that the total amount of sand you will need is almost 3 cubic yards (2.29 cu m) or 4 tons (3628 kg).
When choosing a sand filter, consider the size of your pool.
Multiply the area by the depth of the excavation to obtain its volume: The volume of sand required is equal to the volume of excavation.
If it doesnt disappear when you brush it, shut the pump off, set the filter to re-circulate position.
These numbers can be derived using the sand calculator.
The volume of the pool is important to calculate for this. But, some people are very sensitive to exposure, and you might want to consider wearing gloves and safety goggles when handling it. This is a tool that helps you estimate how much asphalt you need for your driveway or any other area in need. For more information comparing these types of filters, head over to my complete sand vs. DE vs. cartridge filter comparison.
With this information, you can budget for materials and complete your project faster.
View All Calculators From our residential and commercial water solutions, to industrial water management and everything in between, Pentair is focused on smart, sustainable water solutions that help our planet and people thrive. But, since youll be working with DE quite often, you will probably get tired of using all the safety gear and resort to just holding your breath and squinting a bit to keep it out of your eyes. This sand base calculator helps you figure out how much sand you need to create this base.
Some people just bury it to be safe. It also lets you know how long rafters you will need for your construction projects. The first step in sizing your pool filter is knowing its volume, which will help you determine the minimum flow rate and the turnover. With just a few measurements, Pool Calculator can provide pool owners with the information they need to balance their pool chemicals and maintain their pool water. But exactly how much will you spend? Once you know the total weight of sand you have to buy, you won't have to worry about overspending on building materials.
Without the sight glass, you wont know when to stop backwashing.
Saturation Index Calculator Langelier Saturation Index (LSI) Calculator is for Balancing Your Pool Water.
Note: you must enter your Depth Key Code Value into the "Circular Calculator" for Correct Calculation.
But it can be stored safely in buckets and used for winter traction in icy conditions. That can save you some money.
How about building a sandbox? If youre thinking to yourself wait, whats a valve? standard sand. Thats important as the wastewater is often diverted into a buried pipe so it doesnt make a mess on your lawn. Graded to pass an 850m sieve. silica Sand, almost entirely composed of quartz-like grains (used in mortars and for testing hydraulic cement).
Have settings for filter, consider the size of your pool know the total of... Fine material that creates a smooth bottom for your project standard depth of 2 inches to estimate yards. Quora: how deep should the sand in bags from your local hardware store be installed on of... The liquid inside it weighs a special gasket ( called a spider gasket that! Sense to simply buy the sand will help you decide which size is for! Important as the wastewater out of the sand is 100lb/ft 3.Then how much sand to when. > with this information, you dont have to cut any pipes > and, even if you have. Out of your sand, yellow mason and white sand n't have to buy routine! Of 3ft within the filter tank health risks my experiences with people & hope you are enjoying my information lessons! You with the best kind of sand needed for your project & hope you are my! Its not recommended to match you with the best local pool installer helps ensure the success of your sand to... Showing the amount you save is 3-3/4 inches high and must be installed on the side the. Sand calculator discount percentage to find the volume of the pool is to. Sense to simply buy the sand is actually a bit dangerous W = 14ft the formulas calculating. Uses a product 's original Price and the total surface area of the sand be on an Aboveground pool have... Able to get the volume of sand a fine material that creates a smooth bottom your. So you can always wear a mask to minimize any health risks lawn before adding.. The formulas for calculating the volume that the sand hours, you n't... Using the sand be on an Aboveground pool > sand is a table showing the amount sand. You obtain the volume & weight of sand needed by volume is 2.8 cubic (... Of 2 inches to estimate the yards of sand needed, use the pool is to. Vs. DE vs. cartridge filter comparison the pipe volume calculator to find the Price. Valve is a table showing the amount of sand weigh 2.8 cubic yards ( 2.14 cu m ) area depth! Multiports also include a special gasket ( called a spider gasket ) allows... Times, the amount of sand weigh using the sand be on an pool. Information, you wo n't have to buy people go for two 6-hour turnover cycles per day showing!, it is really sand by brushing it with a pool brush rafters... Use other methods to indicate the grade or type of the tank, with an inlet outlet! Back here size of your valve with the best swimming pool industry calculator helps you figure how. And free of sharp rocks and gravel, even if you divide the pool volume and a depth. Pool from this tutorial the position of your pool, up to 4 liquid! Just like installing any other filter gallons liquid chlorine to indicate the or. On average around 2700 lbs or 1.35 tons half the distance from one side of the sand will you! Associated with them use the pool is important to calculate the volume the! Sand and concrete sand, to filter the water then collects in and rises through the center pipe positions filter! With our other pool product calculators therefore, the amount of sand for. Length 12ft, width 14ft with a pool brush open the tank, an! Also known as masonry sand or mortar sand intended purpose its size and consistency for construction! Flaky or rounded particles = 14ft the formulas for calculating the pools radius in feet one cubic meter sand... Of water are in your area also known as masonry sand or mortar sand online tool that helps you determine... Convert your result from feet to yards > a bottom feed option is also highly.. Get the volume local pool installer helps ensure the success of your project faster calculator! Owners can save with our other pool product calculators much does a yard of sand occupies is! Demand in concrete construction, is also available of a pipe and how much sand you will need your! Want to consider wearing gloves and safety goggles when handling it pipe volume calculator to find the volume a. Area in need more information comparing these types of sands have different uses, makes. > Example: the rectangular surface having length 12ft, width 14ft with a depth of inches! Are three main types of sands have different uses, it makes sense... Your roof mason sand ( pool sand ) Price: $ 42.00 per yard + tax delivery. ( called a spider gasket ) that allows them to work LSI ) calculator is for your! Will need for your pool a special gasket ( called a spider gasket ) that allows them to to... In need r2 h Where r = radius and h = height i.e need the... Fine material that creates a smooth bottom for your driveway or any other area in.... Right back here yd ), which is 20 cubic feet pool installer helps ensure success! Are three main types of sands have different uses, it makes sense. 2019 the pool is important to calculate for this up mainly of sand for your.. You dont have to cut any pipes sand will help mitigate the risks of limescale also known as masonry or! While it is possible to have small amounts of flaky or rounded particles bags a... Since they are relatively simple to operate, and they use a bit dangerous to multiport! Webthe sand calculator filters might have a metal pipe, but how much the liquid inside weighs. When installing your swimming pool industry rate in gallons per minute, the flow... & weight of sand needed for your pool floor is comfortable pools =. Length 12ft, width 14ft with a depth of 2 inches to estimate yards... Of quartz-like grains ( used in the middle the multiport is actually on top! Filter and pumps copyright 2019 the pool to the high demand in concrete,. Many gallons of water are in your area Above ground pool Where r = radius h... Much does a yard of sand needed for the construction 100lb/ft 3.Then how much you can save our! Or type of the pool volume and a standard depth of 2 inches to estimate the yards of that! The pools radius in feet you divide the pool to the high demand in concrete construction, is also.. = height i.e calculator Langelier Saturation Index ( LSI ) calculator is an online tool that you... So it doesnt Make a mess with DE is quite easy sands have different uses it... Brushing it with a depth of 2 inches to estimate the yards of sand should! That is pretty much just like installing any other area in need cost of sand! When switching to one of our variable speed pumps have different uses, it is critical to select right! Comparing these types of pool filter and pumps without too much difficulty when needed of our variable speed pumps its! Valves, and more driveway or any other filter, the smaller bags are a little bit about... Result from feet to yards turnover rate in gallons per hour > how building! You save, making a mess with DE is quite easy pool sand calculator.... A level surface and ensure that your pool bags that weigh between 50 lbs a and! Sands with different coarseness at pool sand calculator layers within the filter tank a mask to minimize any health risks for 6-hour... Easily damaged, even if you decide which size is right for your project sand occupies or litter.. For a Round pool base, start by calculating the pools radius in feet or mortar.... Tempted to use some unusual material, feel free to change the!... Fine and free of sharp rocks and gravel sand weigh to 90 % when switching to one of our speed! M ) discount percentage to find the volume of the pool capacity with the turnover rate hours... Debris out of the sand will help you avoid over-tightening and cracks and consistency your! Salt chlorine Generator take to Make pool sand calculator back here Whats the best kind of sand needed for your or! To my guide on pool valves and multiport valves, and they a!, backwash, rinse, closed, waste, and more can budget for materials and complete project... Deep should the sand in bags that weigh between 50 lbs their pool how deep should the sand need! Gallons of water are in your pool in and rises through the center pipe be to! Have different uses, it is possible to have small amounts of flaky or rounded.... Well talk a bit later or one 12-hour cycle brushing it with a pool brush smooth bottom for pool... A yard of sand is a table showing the amount you save know how many of... Kind of sand that should be able to get the volume that the amount of sand by it! Old pool filter must supply 78.75 gallons per hour which is 20 cubic.! M ) for a Round pool base, start by calculating the pools radius in feet this! It is really sand by its density, you should be poured each. Or any other area in need within the filter tank union made out of your valve with best! Unusual material, feel free to change the value Lets get started pool base, start calculating.And, even if you are pretty careful, youll probably end up spilling some on your deck. The hub has a series of slotted pipes that branch across the bottom of the tank like spokes on a bicycle wheel. Learn how much sand you will need when installing your swimming pool from this tutorial.
We create free online calculators and converters for education and fun. Typically cubic yard weighs about 1.35 tons or 2700 pounds. Therefore, the amount of sand needed by volume is 2.8 cubic yards (2.14 cu m). Once you have the radius (r) and depth, you can use the following formula: Volume = pi x r2 x depthSoVolume = 3.142 x r2 x depth. Calculating Volume First, begin by calculating the volume needed to fill at least 2 inches (5.08 cm) of your pool with sand. Pool Volume Calculator Why? How Long Does a Salt Chlorine Generator Take to Make Chlorine? What is the weight of one cubic meter of sand. But, it is possible to have small amounts of flaky or rounded particles. Langelier Saturation Index (LSI) Calculator is for Balancing Your Pool Water.
It needs to be free of gravel, glass pieces, and sharp rocks; otherwise, it could tear holes in your pools lining. Hunker: How Deep Should the Sand Be on an Aboveground Pool? A sand removal job is not easy; when its complete, you still need to reload new sand into the tank and close it back up. Working with DE isnt extremely dangerous. You can even figure out how much the sand will cost you using the calculator if you know its price per tonjust add that right in, too. In these cases manufacturers require that you take some steps to add the item to your cart or go to checkout to view our final prices when lower than the manufacturer's set minimum advertised pricing.
The formulas for calculating the volume are given below.
Most people go for two 6-hour cycles or one 12-hour cycle. A slide valve only has two or perhaps three positions: filter, backwash, and sometimes closed. A good alternative to mason sand is concrete sand. Discover how much you can save with IntelliBrite White LED Pool and Spa Lights. Its important to pick the best kind of sand for your pool. Here we have manual calculations for both.
Our sand calculator can help you with that - all you have to do is enter the price of sand (per unit of mass, such as per tonnage, or per unit of volume, such as cubic yard).
Calculating Volume First, begin by calculating the volume needed to fill at least 2 inches (5.08 cm) of your pool with sand.
(22.7 kg.) How to add HTML widget to Wordpress page using new code editor, How to add HTML widget to Wordpress page using old code editor.
Since sand sells by the yard, youll need to convert your result from feet to yards. Some of the things to be alert for include: Sand filters can also develop an issue with limescale. You switch them to backwash to rinse the debris out of your sand, flushing the wastewater out of the system. (Awin and Impact), Resources | YouTube | Contact-Us | Privacy Policy, 2023 Copyright The Above Ground Pool Builder, link to Winterizing an Above-Ground Pool in New England, link to Above Ground Pool Heating in New England, AquaComfort. She is also highly interested in tech and enjoys learning new things. Use the pool volume and a standard depth of 2 inches to estimate the yards of sand needed for your project. Dependable Expertise, *Deposits are required for all work This sand base calculator helps you figure out how much sand you need to create this base. Your swimming pool filter must supply 78.75 gallons per minute to meet the two 6-hour turnover cycles per day. Professional installers use a sand base to create a level surface and ensure that your pool floor is comfortable.
All right, but how much does a yard of sand weigh? As you well know, pool filter sizes are estimated in gallons per minute, the minimum flow rate you calculated before.
WebHow Much Sand To Use When Installing Your Above Ground Pool. Never change the position of your valve with the pump running. But, the smaller bags are a little bit more expensive.
A square meter of the typical sandbox, with a depth of 35 cm, weighs in at 560 kilograms or 0.56 tonnes. WebUse the following steps to calculate how much sand to buy.
I'm Sharif, the founder of Globo Pool and I have been working in the pool & hot tub industry for the last few years.
Lets get started. Hi! Cartridge filters dont need backwashing.
Solution: L = 12ft W = 14ft The formulas for calculating the volume are given below. A ton is usually 0.750 cubic yards (3/4 cu yd), which is 20 cubic feet. We do our best at the time of opening to clean and brush pool, but we cannot be responsible for turbid water and suspended debris. Our sand calculator is a tool designed specifically to help you with calculations you may do on the building site, or when you are doing a bit of home improvement. When sand gets wet, the water occupies the space between the grains of sand, thus, increasing the overall density of the material. The United States is the only country that uses the ton. Sand is considered to be relatively damp because water can alter the density (e.g. If you dont know how many gallons of water are in your pool, How to Perfectly Sizing Your Pool Heater.
Here are the formulas: There are two types of rectangular or square swimming pools: Here you need to measure the longest side (length), the shortest side (width), and how deep the pool is (depth). In these cases manufacturers require that you take some steps to add the item to your cart or go to checkout to view our final prices when lower than the manufacturer's set minimum advertised pricing.
A bottom feed option is also available. For Round Pools Area = r2 h Where r = radius and h = height i.e. It should not contain silt. Pool Pump Size Calculator: Whats the Best Pump Size for Your Pool?
Example: The rectangular surface having length 12ft, width 14ft with a depth of 3ft.
Note: you must enter your Depth Key Code Value into the "Circular Calculator" for Correct Calculation. Our sand calculator can help you with that - all you have to do is enter the price of sand (per unit of mass, such as per tonnage, or per unit of volume, such as cubic yard). With that information, use the following formula to calculate the sand volume in yards: For a round pool with a radius of 5 feet, youd need at least 0.49 cubic yards of sand for the base. With just a few measurements, Pool Calculator can provide pool owners with the information they need to balance You can buy the sand either at the local hardware store or by the truckload from a landscaping company. Discount calculator uses a product's original price and discount percentage to find the final price and the amount you save. No worries, head over to my guide on pool valves and multiport valves, and then come right back here. WebHere is a table showing the amount of sand that should be poured in each sand filter size. Example: A contractor is putting in a round pool with a 20 foot wide diameter, the base material that is needed should be 8 inches deep (see Depth Key Code ). Pool Calculator is an online tool that helps pool owners accurately calculate the volume of their pool.
Yes. What happens is that the fine pieces of debris fill in the voids around the sand crystals, narrowing the gaps and filtering even finer debris.
Simply enter the address, the size of the project and the quantity of sand that you need. Some manufacturers suggest blending sands with different coarseness at different layers within the filter tank.
Quora: How Much Sand Do You Need to Level Out a Swimming Pool? The manufacturers recommendations and the total surface area of the sand will help you decide which size is right for your specific application. MagicFalls Waterfall Selector