Buying guide for best pool sand filter
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If you want to cool off on hot summer days in your own backyard aquatic center, there are a few things to take care of first. Perhaps the most crucial of these is having the correct pool filter. This important piece of pool equipment keeps the water as clear as possible so you don’t encounter floating debris while you swim.
You’ll still need to use chemicals every now and again to treat the pH level of the water, but the filter plays an important role in removing large particles such as leaves and dirt. How does it work? Essentially, a pump sucks water into the filter where it gets pushed through sand to remove any unwanted materials.
But you can’t just use any old pool filter and pump. For example, you need a pump with the right amount of power for your pool’s water capacity. As you might expect, a smaller pool requires a less powerful pump. If you used that same pump on a large pool, you’d end up with a low flow and partially filtered water. We’ve researched pool sand filters and found the Intex SX2100 Krystal Clear Sand Filter to be the very best for medium-size pools.
Which pool sand filter is best?
Best Filter for Medium-size Pools
Dimensions: 22.25” L x 15.38” W x 23.25” H | Weight: 35 lb | Flow Rate: 35 gal per min | Sand Capacity: 50 lb | Maximum Pool Size: 12,800 gal
Made by a popular brand in backyard water fun, the Intex SX2100 Krystal Clear Sand Filter Pump is a great choice for small to medium above-ground pools. The water aeration provides improved circulation and filtration, improved water clarity and increased negative ions at the surface.
Suited for pools of up to 12,800 gallons, it looks bulky, but it’s a breeze to set up. The filter comes with detailed instructions that are straightforward to follow.
It has a built-in 24-hour timer featuring preset cycles for automatic operation ranging from two to 12 hours. The cycles include filtering, rinsing, backwashing and recirculating.
The pump’s capacity is rated at 2,100 gallons per hour and has a system flow rate of 1,600 gallons per hour. It uses 50 pounds of #20 silica.
The durable strainer does a good job capturing debris and has a basket that's easy to detach and clean. Available at a reasonable price, it's a solid choice for keeping an above-ground pool ready for a relaxing soak or swim.
Best All-weather Pool Filter
Dimensions: 16.3” L x 16.3” W x 34.5” H | Weight: 26 lb | Flow Rate: 30 gal per min | Sand Capacity: 100 lb | Maximum Pool Size: NA
The Hayward ProSeries Sand Filter is an excellent choice if you live in an area with variable weather. That's because it's designed to work effectively in different types of conditions.
The proprietary VariFlo valve ensures reliable flow and optimal performance. Built to last, the filter body is made of extremely durable materials that render it corrosion-proof and low maintenance.
This high-quality filter has a self-cleaning system that keeps debris to a minimum, aiding in efficient water flow and distribution. This makes your pool maintenance job a lot easier and keeps the water sparkling clear.
The filter doesn’t need to function at maximum power all the time, as it has a valve with seven positions for the best operation, depending on your needs. This increases its efficiency while it does its job.
Since it’s an above-ground filter, you must prepare it for colder months. Luckily, it has a large pressure water and sand drain that cleans it out in a few minutes. It uses 100 pounds of sand, which is more than many others require.
Best at Filtration for Small Pools
Dimensions: 17” L x 13” W x 22” H | Weight: 26 lb | Flow Rate: 40 gal per min | Sand Capacity: 42 lb | Maximum Pool Size: 10,000 gal
The XtremepowerUS Sand Filter, an aboveground filter and pump system, is an apt choice for smaller pools, as the 13-inch tank holds 42 pounds of sand, has a flow rate of 40 gallons per minute and functions best in pools holding up to 10,000 gallons. Despite its smaller size, it's highly efficient at filtering, making pool water crystal clear.
XtremepowerUS says it takes less than five minutes to install, as the bundle includes everything you need to get going quickly. It comes with detailed instructions and a useful guide on how the four-way valve works (this multi-port feature includes filter, rinse, backwash, and winter functions).
This filter operates at a low noise level that won’t disturb the neighbors. Which also makes it perfect for those who like to have a relaxing soak without interruption.
Notably, the filter is compatible with filter balls if you prefer not to use the traditional sand medium. It's also available at a low price, which makes it a good pick for pool enthusiasts on a budget.
Affordable Option for Small Pools
Dimensions: 17.75" L x 12.5" W x 23" H | Weight: 20 lb | Flow Rate: 1,980 gal per hour | Sand Capacity: 42 lb | Maximum Pool Size: 8,000 gal
Don't let the low price stop you from considering the Swimline Pool Sand Filter Pump, as it has features that make it a top choice for small pools. It's rated for up to 8,000 gallons and can hold up to 42 pounds of sand, so it’s both effective and efficient for pools that don’t hold an excessive amount of water.
This filter offers standard backwash, winter, rinse and filtration valve functions and keeps water in small aboveground pools fresh and clear.
Although affordable, this filter is built to work properly and last. It features a tough reinforced tank, a stable base and a sturdy valve, so you can expect exceptional performance throughout many pool seasons to come.
You'll also appreciate how easy this filter is to set up and use right out of the box. The included instructions will help with the process, so you don’t have to spend hours getting your backyard above-ground pool ready for splash time. Another reason to love this affordable pick is the quiet operation that your neighbors will barely notice.
Best Filter for Small Pools
Dimensions: 24.4” L x 15.7” W x 19” H | Weight: 22 lb | Flow Rate: 40 gal per min | Sand Capacity: 60 lb | Maximum Pool Size: 10,500 gal
If you have a small aboveground pool, the Swimline Hydrotools Sand Filter Combo Set is an excellent choice, as it's best suited for pools up to 10,500 gallons. The double-reinforced tank holds a maximum of 60 pounds of sand, and the 0.4-horsepower pump has a flow rate of 40 gallons per minute.
The filter is suitable for water with varying chemistries. The strainer catches debris with ease, while the strainer basket is large and easy to install and clean.
The filter comes with a universal base, a four-way multiport valve and a 6-foot cable. Smaller pools are usually found in neighborhoods where the houses are close together, making a pool pump a nuisance. However, this one is designed to operate at a low noise level so you don’t disturb the neighbors.
Another great feature of this pool system is that it’s compatible with other filter brands. That means you can mix and match components when maintenance is required. While it holds 60 pounds of sand, it's also compatible with filter balls. It's also affordable and efficient to help you make the most of your summertime pool fun.
Featured-packed Filter
Dimensions: 22.25"L x 17.63"W x 27.13"H | Weight: 48 lb | Flow Rate: 3,000 gal per hour | Sand Capacity: NA | Maximum Pool Size: 19,600 gal
You don't have to settle for murky pool water. Thanks to its powerful performance, the Intex SX3000 Sand Filter Pump will make your water sparkle. Made by a trusted brand, this filter is ideal for medium-size above-ground pools as it filters those that hold up to 19,800 gallons of water.
With a built-in timer, this filter can be set to two- to 12-hour automatic cycles so the water is ready for you when it's time to get in and relax. It sets up in minutes so you don't have to be a pool pro to keep your water crystal clear. Plus, the strainer basket is large and easy to maintain.
Its advanced circulation feature injects air into the water for improved circulation. This helps fine particles clump together so they can be easily filtered out.
This feature-packed model is also designed to increase negative ions on the surface of the water (which are said to improve alertness and mental health) for the best swimming experience. To top off its impressive capabilities, it's not extremely noisy and comes at a reasonable price.
Best Diatomaceous Earth Filter
Dimensions: 25.9" L x 16.4" W x 28.9" H | Weight: 63 lb | Flow Rate: 74.8 gal per min | Sand Capacity: NA | Maximum Pool Size: NA
If you want a pool filter that works with D.E. (diatomaceous earth), the Hayward Perflex 1 HP Diatomaceous Earth Filter Pump is worth considering. Known for being highly effective at capturing small particles of debris and making water clear, D.E. is a natural silica-based product that's popular in pool filtration.
In addition to its D.E. filter, this model has a powerful motor and a durable build. It's suitable for medium to large above-ground pools.
This pool filter boasts a patented design with long cycles for effective cleaning and minimal maintenance. It has flexible tubes that are self-cleaning, and the filter doesn't require backwashing. The result is efficient filtering of the water and more time for you to indulge in pool recreation.
We also love this filter's sturdy tank that's made with components that resist rust and corrosion. The modular base provides a solid foundation for the unit while it goes to work keeping your pool water free of debris. While you'll pay a higher price for this above-ground model, chances are that you'll find its features and capabilities worth the investment.
Trusted Brand
Dimensions: 25.6" L x 19.5" W x 27.8" H | Weight: NA | Flow Rate: 2,650 gal per min | Sand Capacity: NA | Maximum Pool Size: 15,000 gal
More than just a sand filter, the Intex Krystal Clear Sand Filter Pump allows you to add salt for water that's clear and fresh. Fewer chemicals are necessary to maintain optimal results, plus the filter also kills bacteria for added peace of mind.
It's designed to filter up to 15,000 gallons of water, making it a great choice for medium to larger aboveground pools.
Intex offers its patented HydroAeration technology in this filter, which is engineered to take its filtration abilities to the next level. It functions with water jets that improve water flow from the system to the pool. This equals pool water that's bright, clear and free of particles.
This filter has circulation, rinse, filter, backwash, recirculate and system closing functions to match any pool enthusiast's needs. The sleek digital control panel includes a timer so you can schedule cleaning automatically so the water is ready to use when you are.
The filter is also durable and quiet and comes with a convenient 25-foot cord. Two connector hoses are also included, which simplifies setup.
Budget-friendly Filter
Dimensions: 16" L x 12" W x 24" H | Weight: 21 lb | Flow Rate: 2,000 gal per hour | Sand Capacity: 42 lb | Maximum Pool Size: 7,500 gal
You don't have to spend a lot of money to filter a small aboveground pool, and the CIPU 12-inch Sand Filter Pump System proves it. It's an affordable option that's suitable for pools that hold up to 7,500 gallons of water.
Although it's inexpensive, it keeps water clear with its reliable performance and dependable strainer system. It has a four-way valve system with a simple control. The tank is made of strong material that resists corrosion, and the system has built-in protection from overload for stress-free operation.
Another selling point of this model is its lightweight build, which makes it easy to transport. It's also straightforward to set up — simply remove it from the box, put the components together, choose the setting, plug it in and wait for your water to sparkle. The pump is self-priming, and the drain is in a convenient location for simple maintenance.
This filter holds 42 pounds of sand and is highly efficient for affordable operation. It's also surprisingly quiet when running, which neighbors will appreciate as you and your friends gather for pool parties and afternoon swims.
Best for Large Pools
Dimensions: 23.1" L x 24.6" W x 47.8" H | Weight: 83 lb | Flow Rate: 120 gal per min | Sand Capacity: 7.5 lb | Maximum Pool Size: 60 sq ft
The Hayward ProGrid Diatomaceous Earth DE Pool Filter is made for large in-ground pools. It's a powerful model that works with pools up to 60 square feet in size.
The D.E. does an exceptional job of removing even the smallest particles. The result is a pool filled with crystal clear water that's inviting for swimming or lounging poolside.
Built to last, the durable materials of this model are made to withstand the elements while the important components are encased in a tamper-resistant housing.
The filter is not overly difficult to set up and doesn't make much noise as it cleans the water. It has an air-release valve that allows you to remove air with a simple control.
While it's a pricey investment, this filter is well-made and doesn't require an extensive amount of maintenance. If you have a large in-ground pool, you want to keep the water clear without spending a lot of time cleaning it. This premium model by a top brand is the one to pick to help you make the most of your pool.
Filter type
You have three choices when it comes to pool filters: diatomaceous earth (DE), cartridge and sand.
DE filters offer the highest level of filtration to keep your pool sparkling clean.
On the downside, it’s an expensive option and demands more time for maintenance. Health concerns surround the type of diatomaceous earth used in pool filters, as it’s a severe irritant if inhaled or if the dust gets in your eyes.
Cartridge pool filters have a large surface area thanks to their pleated material. They can generally filter out smaller particles (10 to 15 microns) than sand filters, thus making your pool water cleaner. However, the differences are rarely noticed.
On the downside, particles can be forced through the filter material if the water pressure isn't carefully controlled. Slow flow rates, where the water is pushed through the pump at lower pressures, are recommended for best performance. Thus, these filters don’t work well in a large pool of about 15,000 gallons. While the cartridges can be cleaned easily (simply rinse with a hose), they must be replaced more often than sand filters.
Sand pool filters are usually cheaper than their equivalent cartridge models. Many are more compact, too. They are mechanically simple, and most are very durable. Regular cleaning is simply a question of backwashing, which is easy and takes only a few minutes.
On the downside, they don’t filter particles quite as small as cartridge filters (20 to 40 microns), and some water is wasted when you backwash. As such, you might have to top off the pool and occasionally rebalance the chemicals.
In summary, cartridge filters cost more to buy and maintain, but there’s no doubt that they take more debris out of the water if they're running properly. The question is whether the difference in filtration is enough to trouble you.
A micron is tiny at roughly 0.00004 inch. To give the difference some context, most pollen is between 20 and 35 microns. Anything smaller than 35 microns can’t be seen with the human eye. Both filters trap something that size, though neither is fine enough for drinking water. It’s a personal decision, but you can see why many people are happy with the cleanliness rendered by a pool sand filter.
Features
Your choice depends, to some extent, on whether you’re doing a complete pool, pump and filter installation or simply replacing an existing filter. If you’re starting from scratch, buying a filter/pump combination is possible, and it simplifies the process somewhat. If you already have a pump, make sure your pool sand filter can cope with the flow.
Flow rate
Flow rate is given in gallons per hour or gallons per minute. To convert from one to the other, multiply or divide by 60. For example, 40 gallons per minute equals 2,400 gallons per hour. Most setups are designed to pump the entire pool's contents through the filter once every eight hours.
You should know your pump’s flow rate (usually marked on the body) so you can make sure your pool sand filter matches. While it’s not a bad idea to have a slightly oversized filter, it certainly shouldn’t be too small. Too low a flow rate means the pump works harder than it should to push water through, which will shorten its life.
Tank size and construction
Size is another important factor. A pool sand filter usually has an inch rating that tells you the diameter, indicating the amount of sand it contains. This could be 12 inches on very small models, 16 to 24 inches in the middle range, and 30 or more inches on large versions. For example, the XtremepowerUS sand filter has a 13-inch rating and Swimline's basic model has a 12-inch rating.
Pool specialists caution against trying to save money by installing a model that’s too small. Why? Because the filtration will be reduced. The following are general guidelines:
- 12- to 20-inch tank: Under 10,000 gallons
- 21- to 24-inch tank: 10,000 to 20,000 gallons
- 24- to 30-inch tank: 20,000 to 30,000 gallons
- 30- to 36-inch tank: 30,000 to 50,000 gallons
As for construction, the filter is either a two-piece item (with a seam down the sides) or a single molded unit. While two-piece tanks aren’t necessarily a problem, there is the potential for weakness in construction. Thus, many prefer paying a little extra for a one-piece model.
Motor size
The size (or strength) of a pool filter motor varies. It’s crucial that you get the correct one for your pool.
For residential pools like you’ll find in your neighborhood, pump motors usually range from 0.75 horsepower to about 3 horsepower. The most common for aboveground pools, by far, are pumps that operate at less than 1 horsepower, which is also quieter than larger ones. The Swimline Hydrotools pool filter is a good example of an above-ground model that's quiet yet effective.
The indicated horsepower is a measure of how quickly and forcefully the water is pushed through the filter system and back into the pool.
Multi-port valves
These are common and offer a variety of functions at the turn of a switch. The exact function varies, so it’s worth making a comparison. It’s common to have six or seven positions, including backwashing, winterizing and bypass (so if you’re draining the pool, the water doesn’t actually go through the filter).
Timers
Timers are sometimes built in automatically. More often, however, they’re an option. A timer certainly adds convenience (if you’re running the filter overnight, for example), but it’s an additional cost in many cases.
Aboveground vs. in-ground
A pool sand filter may be described as aboveground or in-ground. The difference in pool type is straightforward: one requires an external shell to support the water container, and the other is sunk beneath the ground’s surface.
As far as the pool filter is concerned, there’s no technical difference. Note that aboveground pools need a smaller filter/pump combination, such as our budget pick, the Hayward ProSeries filter. Hence, you find aboveground pool sand filters as small as 12 inches with under 2,000 gallons-per-hour flow rates. These devices work as efficiently as larger models, but they’re designed for smaller pools. Regardless of which filter fits your needs, our top picks have stand-out features that keep pool water sparkling clean.
Pool sand filter prices
Inexpensive: The cheapest pool sand filters are those for aboveground pools and can be under $100. Those that can also serve as in-ground pool filters start around $150. The XtremepowerUS and Swimline 12-inch fall into this price category.
Mid-range: You have a tremendous choice between $200 and $500, with a wide variety of reliable models from all the top brands. Most pool owners can find what they need in this price bracket. The INTEX Krystal Clear Sand Filter Pump, Hayward ProSeries Sand Filter and Swimline Hydrotools Sand Filter Combo Set are on our list of top models and fall into this price range.
Expensive: High-capacity filters and filter/pump combinations can push prices up to $1,500. Care is needed at this level because some larger filter bodies don’t include valves that must be specified and purchased separately. That said, a few installations of that capacity will be DIY jobs.
How we analyzed
Taking into account how different pool filters can be, it’s important to analyze all aspects of what they are capable of. For example, if you buy the first and cheapest pool sand filter you see, there’s a good chance it won’t be efficient with your pool.
For that reason, we looked at filters of many sizes, motor strengths, sand mediums and flow rates to determine which ones are best for all kinds of pools. We considered customer reviews as well to help us weed out the most problematic models.
FAQ
Q. Is a pool sand filter difficult to install?
A. If you’re a competent DIYer who is comfortable with plumbing and sorting out electrical connections, there’s nothing very complex, particularly if you’re replacing an existing filter. It’s a little time-consuming, but it isn’t technically challenging.
A lot of helpful information exists online, much of it from the filter manufacturers. However, if you’re not confident, you may want to hire a qualified installer.
Q. Does a pool sand filter need much maintenance?
A. No. Backwashing (a simple job that briefly changes the direction of the flow) flushes out most of the collected debris and is done approximately every few weeks, depending on pressure buildup. Changing the sand should only be required every few years.
This is just a general guide. Check your owner’s manual, and adhere to the manufacturer’s recommendations to keep your filter running efficiently.
Q. Is the type and quantity of sand important?
A. Yes. There is understandable confusion between silica sand (widely recommended) and zeolite products (often suggested as an alternative). The problem arises because zeolites typically take up twice the volume, so you only need half the amount.
For example, if a pool filter normally uses 150 pounds of silica sand, you’d only need 75 pounds of zeolites. Despite having bigger granules, zeolites are claimed to offer better filtration of fine particles and dust, which is why they’re popular.
It’s important to follow the advice of the manufacturer or pool installer. Given how infrequently you change the sand, any savings won’t be huge. What’s more, using the incorrect product or quantity can reduce the filter's effectiveness and may even cause damage.
Q. Do I need pool chemicals if I use a sand filter?
A. Yes, you still need to use chemicals if you have a sand filter. The job of the pump and filter is to keep the water clear from debris. However, it doesn’t correct the pH balance or kill any bacteria.
Q. Should I run my sand filter all the time?
In most cases, that won’t be necessary, but it depends on the size of your pool. For residential pools, it is best to run the pump and filter for about eight to 12 hours a day, depending on the season. After heavy rain or long periods of no use, you might want to run it for longer.
