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Thread: Sand filter question

  1. Back To Top    #1
    HardTrance9's Avatar
    Join Date
    Oct 2009
    Los Cabos

    Sand filter question

    Hi guys!

    Hopefully I can get a little help with this:

    There is one pool that has:


    1.5 HP

    Model 190TS

    The filter however is too small and needs to be replaced as it 's causing the pool no to be cleaned properly and black algae started appearing since the original cartridge filter was exchanged for this smaller sand filter.

    The pool capacity is 11,000 gallons and it is a SWG.

    Now a bigger sand filter wants to be installed instead but I am not sure which capacity could be the correct one. There is a measurement of GPM's and we found some selling a filter in good conditions, used, but maybe is too big?? ... 5516_I.htm ... L05-06.pdf

    Any idea on what oversized filter capacity should do the work for this 11,000 gal. pool?

    The current filter does does 40 GPM

    The filter in the lings does 90 to 130 GPM

    Any suggestions?

    Thanks !!
    In charge of some SWG and Bleach pools... still a newbie..

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Sand filter question

    Having a filter that is too small is not going to cause black algae, or any other kind of algae. You get algae when the FC levels are too low, either from adding too little chlorine or from bad circulation causing locally low FC levels. Black algae in particular can only get going when you have dramatically too low FC levels over a fairly long period of time.

    I recommend a filter with about 300 lbs of sand (about 150 kg), or larger. However, the Interwater Model 190TS should work, though require more frequent backwashing, as long as it isn't broken.
    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

  3. Back To Top    #3

    Join Date
    Feb 2008
    Flower Mound, TX

    Re: Sand filter question

    Relocated to Equipment forum as topic is equipment related.
    10K gallon IG gunite with waterfall; Pentair CC320P filter; WhisperFlo 2 HP pump
    TF Test Kits - Pool Math - Pool School
    "It depends."- JohnT

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