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Thread: Sand Filter plus cartridge filter inline questions

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    Sand Filter plus cartridge filter inline questions

    Hello,
    We are going to be getting a 16x32 above ground pool this spring and had questions on filtration. The Intex pool comes with a sand filter. I have been doing some googling on this. Looks like the sand filter is the worst in filtering small particles ~30microns. I was wondering if anyone has put a cartridge filter AFTER the sand filter since the cartridge filter can go to ~10microns. I was thinking that if it is places after the sand then it would not get plugged up very quickly by the bigger particles and the water would be much clearer, especailly for night swimming.

    Or am I just over thinking filtration here? I had an Intex 15' round pool with a cartige that I needed to clean weekly since it was getting clogged by the big stuff.

    Second question..
    We live in Idaho and we need solar heating. I was wondering where is the best postion to place the heating coils are, with regards to before or after the filtration. The Sand filter comes with a Salt Water Generator incorporated in it. I know that the generators produce air bubbles, so my first thought is to have the heater before the filtration so it does not get air in it, but in most information sites, it says to place after the filtration station. I was also assuming that if it was after the filter and SWG the folw of the water would just push out the bubbles and would be of no concern. Just not sure which thinking on this is more correct.

    Thanks
    Tony
    18600 Gallon In Ground
    Vinyl liner
    Aqua Genie Skimmer/Return
    Purex Triton Challenger wet end with Emerson 2EZ Speed Two-Speed with Timer Motor 3/4HP #EB2980T
    Sta-Rite 145361 Cristal-Flo II High-Rate Sand Filter 22Inch
    Taylor K-2006

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    linen's Avatar
    Join Date
    Jul 2010
    Location
    Twin Cities, MN
    Posts
    8,649

    Re: Sand Filter plus cartridge filter inline questions

    Quote Originally Posted by trhardy
    The Intex pool comes with a sand filter. I have been doing some googling on this. Looks like the sand filter is the worst in filtering small particles ~30microns. I was wondering if anyone has put a cartridge filter AFTER the sand filter since the cartridge filter can go to ~10microns. I was thinking that if it is places after the sand then it would not get plugged up very quickly by the bigger particles and the water would be much clearer, especailly for night swimming.

    Or am I just over thinking filtration here? I had an Intex 15' round pool with a cartige that I needed to clean weekly since it was getting clogged by the big stuff.
    The sand filter will be much better than you previous intex cartridge filter. The Intex cartridge filter are notorious for being poor at filtering. People have put filters in series, but imo that tends to be extra work/energy compared to a properly maintained, sand filtered pool that is still quite clear.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Sand Filter plus cartridge filter inline questions

    You definitely want the solar panels after the filter. Ideally they should be before the SWG, but if that is not possible then afterwards will do.

    There is no real point in putting two filters in series, it lowers the overall system efficiency and makes for more total work, while filtering the same as the better filter.

    Sand filters are really very good, even if they aren't as good as the better cartridge filters. The differences are small enough that not everyone can even see any difference (though many can).
    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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