What’s the right filter for your swimming pool: a Pool Sand Filter or a Pool Cartridge Filter? Well, it depends on your pool size, how much money you want to spend, and how much cleaning and maintenance you’re willing to do. We walk through the pros and cons of both sand and cartridge filters.
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⏰ Timestamps:
00:00 - Introduction to Pool Sand Filters vs. Cartridge Filters
00:36 - Sand Filters: How They Work
02:30 - Sand Filter Pros and Cons
02:58 - Cartridge Filters: How They Work
04:02 - Cartridge Filter Pros and Cons
04:32 - What's The Right Size Pool Pump and Filter?
05:01 - Which Is Best: Sand Filters or Cartridge Filters?
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What's the right filter for your pool, a sand, filter or a cartridge filter? Well, it depends on the size of your pool, how much money you want to spend and how much cleaning and maintenance you're willing to do so. Here's the pros and cons of a sand filter versus a cartridge filter check it out before we dive in if you're looking for help keeping your pool clean and clear check out our free pool care cheat sheet at cheat swimuniversity.com, it's a totally free, easy to use Guide to help you keep track of taking care of your pool. Okay, first up is sand filters. Sand filters are just that large filtration tanks, full of sand as your pool pump, sucks water in from the skimmers it pushes through the sand, filter, media filter sand and any of its alternatives are relatively inexpensive and the filter itself tends to run cheaper than other filters.

Too, each grain of sand is textured. If you look at it under a microscope, it has a lot of little rough edges. This helps to grab contaminants and debris as they pass through. Filter sand can grab any particles that measure 20 microns or larger.

Well. How big is a micron? A single strand of human hair is about 50 microns or about .05 millimeters in diameter. Some bacteria can be as small as two microns and that just means filter sand doesn't capture everything as more water flows through the filter over time. The sand's rough edges are slowly worn down by erosion and those smooth surfaces aren't able to grab as many contaminants.

Luckily, you only have to change the sand in your filter every five to seven years. In the meantime, you can clean your sand filter by backwashing. Your filter's pressure gauge will tell you when the internal pressure rate is too high, and this means it's time to backwash. Backwashing reverses the flow of water in your filter to flush out contaminants through your waistline.

It's a simple process, but you do lose some pool water and some chemicals along with it. A sand filter is optimal for large pools because it won't clog as easily as other filters. However, sand filters have the smallest filtration area at only two to six square feet and, like we said, a sand filter doesn't capture smaller particles like some bacteria. That means you really need to stay on top of your pool water chemistry.

If there's not enough sanitizer in your pool to kill those tiny bacteria, your sand filter isn't going to do much to catch them either. So, to recap here are the upsides to a sand. Filter, it costs less money, it's easier to maintain the sand lasts for five to seven years before you need to change it and sand. Filters are great for filtering large pools.

The downsides it's the least, effective filter, only picking up larger particles and covering a smaller filtration area when you backwash, it wastes water, and you lose some chemicals and your filter works less efficiently when pressure builds up. Next up is cartridge filters inside the cartridge filter tank is a plastic cylinder, surrounded by pleated, polyester, filter media water flows into the tank and through the pleats, the filter captures particles as small as 10 microns. This means cartridge filters are more effective than sand filters. Cartridge filters also have the largest filtration area, ranging from about 200 to 600 square feet.
However, they don't work as well in very large pools. Cartridge filters can perform well at low speeds, like with a variable speed, pump and running your pump at a lower speed can help prolong its life. Cartridge filters are typically more expensive than sand filters, and cleaning them is a bit more hands-on. As the filter collects, contaminants you'll want to remove the cartridge from the tank and spray it down with a hose to remove any dirt and debris once or twice a year.

Your filter will need a deeper clean you'll want to spray it down with a filter, cleaner and soak it in a diluted, muriatic, acid or a chemical filter cleaning solution. Finally, you need to replace your cartridge every few years. So, to sum it up here are the pros of a cartridge filter. It can filter contaminants as small as 10 microns, there's no back washing, which means you waste less water and pool chemicals.

It performs well at low pump speeds and it has the largest filtration area. The downsides: well, it's more expensive. Your cartridges only last up to two to three years: you'll need to do a deep cleaning of your filters, one to two times per year and they're, not the best filter for larger pools. Now, before you buy a pool, filter you'll want to make sure you have the right size pool pump.

Your filter won't work properly. If your pump isn't the correct size for your pool, filters are rated by gallons per minute or gpm per square foot. The filter flow rate must be the same gpm as your pump or higher with pool filters. It's best to go for the larger size, so it can handle the power of your pump if you need help figuring out the right size, pump or filter for your pool.

Be sure to check out our filter guide at swimuniversity.com, alright, so we've weighed the pros and cons so when it comes to buying a filter which one is better sand filters or cartridge filters. Well for the clearest pool water and the best filtering go with a cartridge filter. They capture, smaller particles, cover a larger filtration area, operate at low pump speeds and are easy to maintain. But if you have a very large pool where you tend to have a lot of algae problems, go with a sand filter a sand filters back, washing mode makes them really easy to clean and they won't clog as easily as other filters.

If you have any more questions about pool maintenance, go check out our free pool care cheat sheet at swimuniversity.com cheat sheet, and if you found this video helpful leave a comment hit the like button and subscribe for more pool maintenance tutorials throughout the season. That's it thanks again and happy swimming.

27 thoughts on “Sand filter vs. cartridge: what’s best for your pool? | swim university”
  1. Avataaar/Circle Created with python_avatars J.C. Hall says:

    The small square footage for a sand filter can be misleading as the particles are not always trapped on the surface of the sand bed, different particle sizes and shapes will see their own level in the sand. Service area Kanata??

  2. Avataaar/Circle Created with python_avatars Godfathers says:

    Cartridge all the way Are you in Barrhaven ?

  3. Avataaar/Circle Created with python_avatars Pwrmic says:

    My cartridge filter only lasts a year here in FL

  4. Avataaar/Circle Created with python_avatars AaronCPatriot says:

    We want to get a cartridge filter for our 18×36 oval pool that’s around 25,000 gallons and replace the sand filter, is my size pool too big? Thx

  5. Avataaar/Circle Created with python_avatars Geoff says:

    DE all day

  6. Avataaar/Circle Created with python_avatars Dana Hui says:

    I just moved in a new place with a pool on sand filter. How can I tell if it's time to replace the sand in the filter? Are you in Ottawa ?

  7. Avataaar/Circle Created with python_avatars trans am says:

    Cartridge filter for me alot better

  8. Avataaar/Circle Created with python_avatars Richard Johnson says:

    TIL: Human hair is the ebola virus

  9. Avataaar/Circle Created with python_avatars Cheroske Team Home Finance says:

    What would you consider to be a small size pool and/or a large pool

  10. Avataaar/Circle Created with python_avatars Dr. Worm says:

    I replaced my filter's sand media with recycled glass. I used less than 50% by weight and I also use the trick of adding about two cups of DE. I used the the DE trick on sand as well and its always helped significantly. The glass alone works better than sand. When working in combination with glass, the 20K gallon pool can clear an algae bloom in less than 48 hours of continuous running. The two cups of DE gets replaced after each backwash. Hope this is useful for folks.

  11. Avataaar/Circle Created with python_avatars 1kgsxrk7 says:

    I love these videos! Thanks guys.

  12. Avataaar/Circle Created with python_avatars Natasha Head says:

    I have a DE filter and I hate it

  13. Avataaar/Circle Created with python_avatars Andy Twentyman says:

    Rinse your cartridge filters once a week?

  14. Avataaar/Circle Created with python_avatars Cj Lively says:

    Stock tank pools are the rage! Do you have any comments about filters for a small application such as a stock tank? Thanks!

  15. Avataaar/Circle Created with python_avatars Nitin says:

    Very nice informative video

  16. Avataaar/Circle Created with python_avatars GiiLES says:

    How many gallons is in a "Small" or Big" pool?

  17. Avataaar/Circle Created with python_avatars Jean Fonvil says:

    Hi could you make a video on smaller pools like the 10 ft by 6 ft by 18 in inflatable pools. Or something in that range covering care and maintenance without constantly dumping out water, because not everyon has a big pool .please and Thankyou.

  18. Avataaar/Circle Created with python_avatars Colin Clifton says:

    Has anyone upgraded their Pentair Triton with the ClearPro kit? I can't find any information on the web about it. Its supposed to make the filter 60% more effective and catching small particles. I just purchased a Triton TR100, but can't find any materials on the upgrade kit. Please advise.

  19. Avataaar/Circle Created with python_avatars Cody Harris says:

    I have both so I have a 2 stage filtration I have a 400 lb sand filter and a 200 square ft cartridge filter. I also use a dolphin pool cleaner which reduces backwashing significantly

  20. Avataaar/Circle Created with python_avatars Jason says:

    I have a cartridge filter and love it. I have a 8000 gallon pool with a oversized filter and Water is super clear and never had a issue yet

  21. Avataaar/Circle Created with python_avatars I like pears! says:

    Cannot believe you didn’t include DE filters here as well; would have loved your views on this very popular filtration option.

  22. Avataaar/Circle Created with python_avatars ReefMimic says:

    I’ve seen huge sand filters at public aquariums. If they can keep rare fish alive in a closed looped system , they have to be more than suitable for a pool.

    Backwashing sand filter> cleaning filter cartridges for hours on end

  23. Avataaar/Circle Created with python_avatars Brandon Robinson says:

    Any thoughts or comparisons against a DE filter?

  24. Avataaar/Circle Created with python_avatars Hernan Ortuno says:

    d.e

  25. Avataaar/Circle Created with python_avatars Jean-Marc Auroi says:

    I have a 4 meter by 12,5 m long pool down in hot Baja California Sur. Would you rather go for sand filter, considering I want to install a low speed water pump needing less energy? It looks like I have pros and cons on both sides 😉

  26. Avataaar/Circle Created with python_avatars Cassie Millings says:

    I have a Intex pool 15×48 and a intex sand pump filter. Intex 2800 Gpm, Is it the right sized for this pool? Also, I have so many problems, such as sand gets in my pool. Then cloudy water, had a green pool a couple of times. I've only had the pool since July 2020, replace the sand pump once due to sand in water. Now seems to have a little of the same. No broken laterals, it seems the pressure gauge is not reading. I have learned more watching your videos. I was considering using pool balls. How effective is that? Or should I get a cartridge filter? Are you in Orleans ?

  27. Avataaar/Circle Created with python_avatars Rick Washek says:

    Sand filter with chlorinator, all day Service area Nepean??

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