How to Buy the Best Pool Filter

You know the importance of a pool filter to keep it clean from the constant contamination brought in by swimmers, the wind, and even articles used in and around the pool. Despite being a simple piece of equipment, not many people know how to buy the best pool filter because there isn’t enough credible info available. If that rings a bell, this guide can solve your problem.

Choosing the Right Type of Filter for Your Pool

Depending on their construction, there are three main types of pool filters:

1. D.E or Diatomaceous Earth Pool Filters
2. Sand Pool Filters
3. Cartridge Pool Filters

The million-dollar question is: which one of these is the best? Well, when it comes to pool filters, there is no one-size-fits-all formula.  In other words, the best type of pool depends on your needs and your budget. However, if you wanted to know one key factor that determines the performance of your pool filter, it’ll be the size of the filter.

So, if you had just one takeaway from this guide, let it be: choose a filter at least one size bigger than you think you need. In other words, the biggest filter you can afford is almost always the best filter for your pool. All the other things such as brand, name, type, color come second.

Before we talk about each type of filters, let me throw in another very important question.

How to Find Out the Right Size?

This is where most people will drop the ball. They will either guess the right size or will simply consider the overall size of their pool and end up choosing the wrong filter size. Fortunately, here’s an ABC simple step-by-step formula to determine the correct size:

• Step 1. Calculate the total volume of the pool. For a square/rectangular pools, the formula is length x width x depth. For circular pools, it is radios x 3.14 (pi) x depth.
• Step 2. Calculate the capacity of pool in gallons. You can do so by multiplying pool volume (step 1) by 7.48 (which is the number of gallons in a cubic foot of volume)
• Step 3. Calculate the flow rate of water. You can buy cheap hardware sensors for this, but better yet, we have a formula, which costs nothing. Flow rate = capacity of the pool divided by turnover rate. Turnover rate is the total time required to circulate the body of water equal to the capacity of the pool.
• Step 4. Get your ideal filter, whose flow rate matches the flow rate of the pool. Remember, the actual flow rate of a filter can be derived by multiplying the filter rate by filter area.
• Step 5. Remember to choose at least one size bigger!

Diatomaceous Earth Filters

Ideal for: people who have enough budget to afford top of the line product

Average price:  $800

Also, known as DE filters, these are considered to be the most reliable filters. They are made of a series of fabric covered filter elements or grids, which is coated with Diatomaceous Earth – a white powder found on earth.  The magical capabilities of the powder let you filter out even the microscopic particles, ensuring pure, clean water in the pool.

Read More: Robotic Pool cleaner.

Pros of DE filters:

• Filters particles that are as small as 5 microns
• Easy to refresh as all you have to do is add DE powered through the skimmer
• High performance, long life

Cons of DE filters:

• Expensive
• The powder is considered to be a carcinogen and must be dealt with care
• Needs cleaning at least once a year depending on your use

Sand filters

Ideal for: people who want a hassle-free, budget-friendly filter

Average price: $250 (for above ground sand filters) and $600 (for in-ground sand filters)

These are the most commonly used and top rated pool filters. They are usually two to four feet in diameter and look like a big ball. Just as the name suggests, they contain sand, while there’s a drain pipe at the bottom of the tank. The water passes through the sand, leaving any impurities behind, and goes out of the filter through the pipe at the bottom.

Pros of sand filters:

• Affordable
• Very easy to maintain. Simply backwash and rinse.
• Sand is easy to acquire and lasts for many years

Cons of sand filters:

• Water wasted through backwash and rinsing when cleaning
• Filters only down to 20 microns
• Creates a lot of pressure

Cartridge filters:

Ideal for: People who don’t want to spend time maintain the pool

Average price: $400 (for above ground sand filters) and $750 (for in-ground sand filters)

These are the energy- and cost-efficient filters that are pretty similar to the DE filters, however, there is no DE involved. Water enters the filter that has one or more cylindrical cartridges of pleated mesh material. All the impurities get stuck in the cartridges, while the water goes out the pipe at the bottom, into the pool.

Pros of cartridge filters

• Energy- and cost-efficient
• Helps save water
• Can filter down to 10 microns

Cons of cartridge filters

• Needs maintenance – you’ve to take the cartridges out and wash them
• Worn cartridges need to be replaced (not very frequently though)

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Now you know the types of pool filters, let’s review some of the very best filters available on the market. Since there are two major categories of pool systems i.e. in-ground and above ground, we’ll talk about the best filters in each category.

Best Pool Filter on the Market

Picture	Model	Type	Dimensions
	Hayward S270T Pro Series 27-Inch	Sand Filter	27.5 x 44.5 inches
	Pentair 160301 Clean & Clear Plus	Cartridge Filter	22 x 22.5 x 45 inches
	Hayward C5030 525 Square Foot SwimClear	Cartridge Filter	24 x 24 x 46.5 inches
	Hayward DE4820 Pro-Grid Vertical	DE Filter	24.5 x 41.7 inches
	Intex Krystal Clear Sand Filter Pump	Sand Filter	25.5 x 17.63 x 27.13 inches
	Best Choice Products Pro	Sand Filter	19 x 28 x 31 inches
	Hayward Perflex Extended-Cycle	D.E. Filter	15.5 x 32.5 inches

Best In-Ground Pool Filter Systems

Hayward S270T Pro Series 27-Inch Pool Sand Filter for In-ground Pool

Buy from Amazon.com

This is one of the most popular and most powerful in-ground pool filter systems, and there are many reasons for that. The weather-proof, corrosion-proof tank is made of a sturdy polymeric material and comes with a patented six-piston multi-port valve. The user-friendly lever action operation of the valve makes it very convenient to use. It works on the backwashing principal and ensures that water in your pool is crystal clear. The affordable price, ease of use, and low maintenance further sweeten the deal.

Pros

• Made of extremely durable weather- and corrosion-proof materials that can withstand any type of weather for a very long time to come
• Comes with a gigantic pressure drain (either sand or water) for speedy servicing
• Backwashing is very simple and ensures water in your pool is crystal clear
• The filter system is highly energy efficient and can save you decent money in terms of electric bills, thanks to the full-flow technology
• Very simple to operate and requires very little maintenance
• Despite being a high-quality system, it’s very reasonable priced
• Great pro-active customer service. In fact, their Hayward service has reached out to people who had a bad experience and posted their review online to help them sort out their issue. Kudos!

Cons

• The packing that the product comes in isn’t great. This isn’t a deal breaker, but when you invest a handsome amount of money, you can expect more than a large cardboard with the product freely jostling around in it.
• Comes with one a one-year warranty
• It’s rather heavy for its size, but this can actually be a benefit as it shows the durable build of the unit.

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Pentair 160301 Clean & Clear Plus Fiberglass Reinforced Polypropylene Tank Cartridge Pool Filter  420 Square Feet

Buy from Amazon.com

This innovative cartridge filter comes with an outsized filter area that lets it catch more dirt and impurities. The most notable thing about this filter system is that it has an effective filtration area of worth 420 square feet. On top of that, it has a flow rate of 150 gallons per minute. However, your system flow can be different depending on the exact plumbing size as well as other components of the overall system.

I had a pleasant experience with the filter; its speedy action turned one of my friends’ green and filthy looking puddle into a crystal-clear pool in no time. One thing to note is that it’s not corrosion-proof but corrosion resistant. But the unit seems very durable and reliable.

Pros

• This NSF listed filter comes with a massive filter area for enhanced capacity with 1.5inch, 100% drain clean out port.
• Comes with a high flow internal air relief as well as manual air relief valve.
• Instant action, thanks to an effective filtration area of about 420 square feet and a flow rate of 150 gallons per minute.
• Lasts a very long time thanks to the durable materials used
• Perfectly works on gigantic pools. The friend I mentioned above had a 30,000-gallon deep-end pool.

Cons

• Just like any other cartridge filter system, the Pentair 160301Clean & Clear Plus needs cleaning every year depending on your use
• The pool system is comparatively expensive, but it is well worth the price.
• Comes with just one-year-warranty

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Hayward C5030 525 Square Foot SwimClear Cartridge Filter

Buy from Amazon.com

Hayward might be better known for their sand filters, but they have pretty much changed their one-dimensional persona with the C5030 SwimClear. This is an innovative filter in cartridge technology with a cluster of 4 reusable elements for up to 425 square feet of immense capacity and extended filter cycles.

In addition to the quad-cluster cartridge elements that offer a great filter area, which can hold extra amount of dirt and impurities, several other features make it a great fit for any private pool. Firstly, it comes with a massive, tamper proof, clamp that holds the two –piece unit together, but also offers easy access to innards – which makes maintenance and repairs a breeze. Moreover, the CPVC union connection adds diversity to the unit, making it compatible with both 2-inch and 2.5-inch piping, offering extreme performance with the 2-inch full-flow internal piping.

Pros

• Offers very fast clean-out, thanks to the 2.5 inbuilt drain
• The quirky design lets you easily remove the cartridge elements
• The unit is not only sturdy but can withstand immense heat because of Noryl bulkhead
• Barely needs any maintenance, especially when compared with sand filters in the same class
• The unit helps you preserve a lot of water as there is not water going to waste because of backwashing. This makes it an ideal unit for areas where water is in short supply.

Cons

• With some units, people have complained an issue with the manifold. Though we personally had no such experience. But thanks to Hayward’s great customer service, you can get a replacement for it.
• Cartridges need to be serviced/replaced, though not too often.
• The price of the unit is on the higher side.

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Hayward DE4820 Pro-Grid Vertical DE Pool Filter

Buy from Amazon.com

Hayward DE4820 is a vertical grid filter, designed for in-ground pools as well as spas of all the different types and sizes. Just as the name suggests, it’s a DE based filter that pushed unfiltered water into filter elements and evenly distributes DE to grids.

The unit has the trademark Hayward design, with a heavy-duty, one-piece clamp that securely fits the tank top and the bottom together. This not only makes maintenance easy but also allows a convenient, quick access to innards, without requiring you to mess up the piping connections. The size and power of the Hayward DE4820 Pro-Grid Vertical DE Pool Filter make it an equally good choice for both commercial and residential use.

Pros

• Durable build ensures years of non-corrosive, hassle-free performance
• Available in a wide variety of sizes: 24, 36, 48,60,72-square foot, so you can choose one according to your pool size.
• Made of Perma Glass XL, the filter offers ultimate strength and durability
• In addition to combination pressure and cleaning cycle indicator gauge, the filter comes with a manual air relief and high-impact grid elements.
• Easy to install and even easier to use. There is just one lever to turn that lets you control all the settings. If you’ve used any of the older filters, you’ll love this one
• Great pro-active customer service. In fact, their Hayward service has reached out to people who had a bad experience and posted their review online to help them sort out their issue. Kudos!

Cons

• The filter doesn’t come with a user manual. Although it’s very easy to install and use, an instruction manual is always nice.
• The picture on most online stores show a slide However, that is not included with the filter. Not an issue with the product, but seems like a weird marketing ploy.
• The packing isn’t great for a product that cost a decent amount of money.

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Intex Krystal Clear Sand Filter Pump for Above Ground Pools with GFCI

Buy from Amazon.com

If you’re on a budget, yet want a filter system that works as good as any other filter and needs little maintenance, consider the Intex Krystal Clear Sand Filter Pump. It uses sand to filter water for your pool. In addition to filtering, the sole valve allows you to backwash, recirculate, drain, and even close the system – making it very simple and convenient to use.

The smart filter has a built-in 24-hour time which makes the overall experience of keeping your pool crystal clear hassle-free. The system is available in four different models, 1050 GPH, 1600 GPH, 2150 GPH, and 3000 GPH. The most powerful unit i.e. 3000 GPH can work for above ground pools as big as 16′ and above. The best thing about the Intex Krystal Clear Sand Filter Pump for Above Ground Pools with GFCI is that it requires zero maintenance – all you have to do is replace sand after five years.

Pros

• Extremely affordable with virtually no maintenance cost
• Very easy to use and maintain. Built-in timer further adds to ease of use.
• Available in four different sizes, you can find one that perfectly fits your bill
• Works pretty quickly, thanks to the higher flow rate
• One valve lets you do everything from filtering to backwashing to recirculating to draining to closing

Cons

• The only real concern with this filter is that it is only compatible with custom adapters, and the package doesn’t come with all adapters. You’ll need to buy a couple of adapters to set it up.
• Is not as durable as some of the other filter systems
• Can be a bit loud at times, but normally there’s nothing more than a little humming sound.

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Best Choice Products Pro Above Ground Swimming Pool Pump System

Buy from Amazon.com

This cutting-edge, well-designed pool filter system has been specifically designed to keep your pool pristine while requiring minimal maintenance and consuming negligible power. Yet, its unique design allows an efficient way to suck water from the skimmer into the filter tank. It features a six-position multiport valve for easy operation.

You’ll be amazed to see clean water in your pool like never before. The trick behind its great performance is that it has a high capacity sand bed which causes water to get exposed o more surface area. This results in all the impurities getting caught in the sand and pure water leaving the filter. The Best Choice Products Pro Above Ground Swimming Pool Pump System is simple to install, easy to use and offers great filtration performance, quick backwashing, and stretched filter cycles. It’s one of the very few UL listed, thermal protected, and CSA certified filter systems available on the market.

Pros

• Reasonably price filter system, yet very powerful as well as easy to use.
• Has a massive 175lbs sand capacity
• Comes with ETL listed mark, which means that your filter has been tested by an independent organization and meets the standards of applicable published safety.
• The unique one-piece design is non-corrosive as well as sturdy.
• Sand bed always stay level because of the internal filter design and water gets in contact with more surface area, ensuring cleaner water.
• The dirtier the sand gets, the better the filter works and catches more impurities, so the performance keeps going up.

Cons

• It’s not compatible with most pools out of the box so you might have buy fittings, 1 1/2 PVC pipe, PVC glue, Teflon tape, and other items to configure the
• It does waste some water, so might not be the best choice where water is in short supply.
• Although we may not call it fragile, yet it’s not as durable as compared to some other filters we have discussed above.

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Hayward Perflex Extended-Cycle Above-Ground/In-Ground Pools D.E. Filter

Buy from Amazon.com

This is an amazing little filter system available in three different models i.e. EC40AC, EC50AC, and EC75A, each ideal for the different type of pool. The most notable feature of the Hayward Perflex Extended-Cycle D.E. filter is that it has a bump handle that makes the flex-tubes clean themselves.

It’s a heavy-duty system that is extremely durable and offers corrosion-free performance for many years to come. The Hayward Perflex arguably offers the most comprehensive clean, as most other filters remove impurities down to five microns, while this little bad boy can catch down to one micron.

Pros

• Can catch dust, pollen, and other impurities as small as one micron
• Doesn’t waste any water or power – ideal for areas where water isn’t abundant
• Works very fast, your pool can turn from milky to crystal in as short as two hours
• Very quiet, you won’t even know if it’s running
• Reasonably price
• Small, lightweight and easy to use. Every once in a while, just hold the filter by the handle, and you can shake the DE powder to recoat the DE filter.

Cons

• The plastic body doesn’t seem very durable, although we haven’t seen any cracks or damage yet.
• The unit can get clogged, though not very often and is easy to fix, however, it is a nuisance.
• The title can be a little misleading, the unit not compatible with in-ground pools; only the pump can be used with above ground

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Conclusion

We have explored the very best filters available for both in-ground and above ground pools. Choose the one that’s right for your pool, and you’ll spend less time cleaning and more time swimming. Enjoy!