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Thread: Can a Filter be to big?

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    Can a Filter be to big?

    Hi All,
    I have a 25K gal pool that is difficult to keep clean due to the gale force winds that blow all kinds of organics into my pool between Oct-March. When I bought my home, the pool had a 48 squ ft leaf DE filter. It is not unusual for me to be cleaning the filter and replacing the DE once/month in the windy time period. For a time, I had a pool guy, he recommended and I installed a Sta-rite system 2, 48 squ ft filter. While it is a bit easier to breakdown with the one cartridge, the frequency of cleaning has not changed.

    THE QUESTION, if a bigger filter will physically fit into my system, is there any downside of installing a larger filer? 60? 100 squ ft? Is there such a thing as to big? It seems to me that increasing the filtering surface area will reduce my cleaning frequency. Certainly I understand to cost both buying a new filter and using more filtering media. My primary focus is in my desire to reduce cleaning time. THANKS!

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    Mod Squad tim5055's Avatar
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    Re: Can a Filter be to big?

    Welcome to TFP!

    Well, I don't like to say never, but most people need a bigger filter and a smaller pump than they think they need. I see many here with those big honkin triple or quad cartridge filters who say they only clean a few times a year at most because or the filter size in relation to their pool.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Mod Squad Bama Rambler's Avatar
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    Re: Can a Filter be to big?

    In cartridge filters, there is no such thing as too big. You don't have to worry about backwash flow rate, so there's no practical limit on how big it can be.

    With Sand, and DE to a lesser extent, you need to be concerned with the recommended backwash flow required to clean the filter. And that's not a concern with a DE filter as long as you tear it down and clean it every time and you're not backwashing it.

    In your situation, I think I'd (to use Tim's words) go with a honkin big cartridge filter in the 500 sqft range.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    Re: Can a Filter be to big?

    No down side I can think of to a larger filter. Many on here myself included also use hairnets in the skimmer basket. There is a windy season where I live too and the hairnets grab the small seeds that would otherwise make it to the filter, I have to replace them almost daily for a few months but I would be out there emptying the basket either way and it is much faster to pull the full net out and install a new one then try to bang all the debris out of the basket. Cost about $6 on Amazon for 100 hairnets.
    12,300 Gallon, IG PebbleFina, 3 ft sheer, 2 Jandy nicheless LED lights, Jandy Pro 1.5HP VS pump (A.O. Smith Motor), PB4-60 Booster pump, Polaris 280, Jandy cv340 cartridge filter, Zodiac Z4 control panel W/iAquaLink, Stenner pumps for chlorine & MA connected to WiOn WiFi switches, TF-100. You can support TFP with AmazonSmile just click the link!

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    Re: Can a Filter be to big?

    Thanks guys. Just to be clear that Im not misusing terms. My filter is a DE filter. Im calling the insert that the DE adheres to a cartridge. It is a single unit cylindrical. This thing. And I have no backwash ability.
    filter cartridge.jpg

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    Mod Squad tim5055's Avatar
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    Re: Can a Filter be to big?

    Nothing says you have to get another DE filter. They make some really nice straight cartridge filters.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    JoyfulNoise's Avatar
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    Can a Filter be to big?

    Pentair Clean & Clear 520sq ft cartridge filter is a great unit. I have a Pentair QuadDE100 filter but, if/when I consider a replacement, I'll likely go with a Clean & Clear.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: Can a Filter be to big?

    There is no doubt that DE produces the clearest water. However, unless you are looking at your pool at night with the lihgts on I doubt you will see much difference between the three filter types.

    I have a large Cartridge and my pool is just about surrounded by trees -- I clean it twice a year.
    22k gallon IG pebblefina, Jandy 1.5 HP VS, Jandy CV Cartridge filter, Fafco solar panels, Polaris 360 supply side cleaner, waterfall

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