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Thread: Filter Blow-through??

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    Filter Blow-through??

    I installed a new 1 HP Intelliflo last year and pretty much all of my runtime is on low speed. My Polaris is wired to run only on high speed. The pool is 20,000 gallon inground with an IC20 installed downstream of pump and sand filter. It seems that when I run in high speed, I end up with cloudy water and it takes several days of only low speed runtime to clear up. Of course in this time, I'm not vacuuming so I'm having trouble keeping the bottom clean, and we all know where that leads.

    If anybody has past experience with something like this I'm all ears. I believe that my high speed flow is too high and blowing thru my filter; if this is the case I would think a valve to throttle flow rate downsteam of the pump would be a solution. I can restrict flow into the pump as of right now (balancing valves from skimmer and bottom drain) but I've never been a fan of starving a pump to flow down. Any ideas?
    18x36 Vinyl IG ~27,000 gal, Intelliflo VF Pump, 300# Sand Filter, Polaris 280 w/Pentair Booster Pump, Pentair EasyTouch w/ IC40 SWCG
    TF100 Test Kit

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Filter Blow-through??

    Your filter has a gpm rating that you can find online but it should be printed right on the filter. If your pump gpm is exceeding that filter gpm, you are probably correct. If you cannot take the pump down from high speed, Your idea of a throttle on the pressure side is fine.

    Is there a reason the SWG will only operate on high?
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Filter Blow-through??

    What is the rpm that the intelliflo is running on high? Since an intelliflo is variable speed you can limit the speed it runs on high.

    What size is the filter you have?
    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
    Pool School ----- Pool Math ----- TF-Test Kit

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