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Thread: Do Phosphates effect CC?

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    Do Phosphates effect CC?

    I've read that phosphates dont really affect the pool chemistry very much unless you have algae. But having them in the water, wouldnt that lead to a rise in CC? Or does the FC leave them alone?

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    In the Industry

    Join Date
    Nov 2011

    Re: Do Phosphates effect CC?

    We have tested pools in excess of 3000ppm on phosphates and had no chlorine showing on any kind of test kit. Lowered phosphates to below 500ppm and finally able to get a residual on chlorine. For what that is worth.
    Over 30 years in the pool business
    We build vinyl, fiberglass, stainless steel pools
    Certified in Hydraulics

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

    Re: Do Phosphates effect CC?

    Swimcmp, The phosphates really had nothing to do with that other than to be food for the algae that was growing. If you'd have shocked the pool correctly the phosphates would have been a non-issue.

    Phosphates have no direct effect on the CC's. Being that they're algae food, you may see a higher CC reading when shocking because any algae that's there has plenty to eat and therefore can grow faster than if there wasn't any. So you're having to kill more once it gets started.

    Of course, if you keep the pool properly chlorinated you'll never have to worry about it getting algae and thusly you'll never have to shock, therefore you'll never see your CC's over .5 regardless to how much phosphates 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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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Do Phosphates effect CC?

    My phosphate level was over 5,000 for several years without any issues at all. CC was always zero. Chlorine usage was normal. Phosphates does nothing directly to increase CC, though as Bama mentioned it can have an indirect effect by speeding up the growth of algae.

    swimcmp, situations like the one you report typically come from failing to understand how the shock process works and thus never killing off the algae growing in the pool. If you shock as described in Pool School, it really doesn't make any difference what your phosphate level is. Off course, it is possible to kill off the algae in other ways, for example by lowering the phosphate level, but that ends up being more expensive and more likely to cause other problems.
    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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