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Thread: Pentair filter 420 vs 520

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    Join Date
    May 2008
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    Pentair filter 420 vs 520

    We are getting ready to build a pool with 380 sq. foot surface area, a max depth of 5 feet and a 7"x7" raised spa. Our builder quoted a Pentair clean and clear plus 420 filter. I asked if it would be smart to upgrade to the 520 filter. They told me that the 520 would only give me about a week longer run time between filter cleanings over the 420. Does this sound right?

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    bobodaclown's Avatar
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    Apr 2011
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    Re: Pentair filter 420 vs 520

    Here's the manual: http://www.pentairpool.com/pdfs/178558MOM.pdf

    It looks like the replacement filters for the 420 are a bit cheaper (less material) than the 520 and there appears to be more options on the 420 filters. Did a quick search on google shopping.

    520 filters: https://www.google.com/search?q=R173...razz:&tbm=shop
    420 filters: https://www.google.com/search?q=R173...razz:&tbm=shop

    There looks to be a $200 dollar difference in housing cost also.

    The 420 may be a better overall value.

    Here's a similar question with the owner ended up with the 520: http://www.troublefreepool.com/threa...or-28-000-pool
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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    JasonLion's Avatar
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    Re: Pentair filter 420 vs 520

    The 520 will go roughly 24% longer than the 420. How long that is depends on the specific situation, and can vary quit a bit. In a typical case it will be more than a month additional between cleanings, shorter if you have a lot of debris entering the pool, longer if very little falls in the pool.

    The larger filter is also just slightly more energy efficient.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Pentair filter 420 vs 520

    Only $100 more up front and $34 per filter change. Hard decision. How long between filter changes? I understand it varies but what would be a good guess.

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    bobodaclown's Avatar
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    Re: Pentair filter 420 vs 520

    Depends on how you treat the filters 5 years or more is not uncommon.
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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    Divin Dave's Avatar
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    Re: Pentair filter 420 vs 520

    at 380 sq ft, x 5 ft deep + the spa, im making a best guess that might be about 13K gallons.
    I have a CC 420 on 15K gallons and only have to clean my filter once a year and honestly, I could easily stretch that for a couple or 3 more months.

    Like others says though, every pool will be a bit different, so your exprience might be a little different.

    In any case though, the 420 would be awesome. Dont know that I really see any significant advantage in going bigger. But if you want to, it wont hurt anything. Rule of Thumb on Cartridge filters, is "the bigger the better"

    If my guess of the volume is about right, I would expect the cartridges to last for quite a few years.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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