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Thread: High Phosphates

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    Aug 2016
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    High Phosphates

    Hello,

    Our pool is only four months old and as of the last few weeks it seems we have been experiencing high phosphates every time we have the water tested. The water is clear and no algae that we can tell. I read many articles on here that say high phosphates aren't a concern if the FC and CYA are in check but it seems odd that it wasn't an issue before and now it is. Any thoughts?
    TC: 5
    FC: 5
    PH: 8 (It is a newly plastered pool so we are adding acid every few days as needed to bring this down)
    TA: 105
    CH: 420
    CYA: 90
    SWG: 3700
    Phosphates: 2500

  2. Back To Top    #2
    Mod Squad mknauss's Avatar
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    Re: High Phosphates

    Do not go to the Pool Store for testing. Do your own. No need to consider phosphates as long as you maintain your FC levels appropriate to your CYA.
    6000 Gallon IG Fiberglass with integrated Spa;Pentair CCP240 Cartridge Filter with Pentair Intelliflo VS Pump and HTR250 heater. IC40 SWG. EasyTouch 4. Dolphin Active20 Robot "Roadrunner", TF 100 Test Kit w/SpeedStir!
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    Marty

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    Swampwoman's Avatar
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    Re: High Phosphates

    Charid, maintaining to FC/CYA Chart will effectively avoid algae, so its true it doesn't matter a great deal...but like most things, there's a tiny grain of truth to the poolstore hype. The tiny grain of truth is that phosphate is in fact a nutrient to algae.

    While the TFP way advocates simplicity above all else, ( eg you dont need phosphate remover so don't add it) there are those who will use products such as Seaclear phosphate remover periodically to prevent a major build up.

    2500 ppb is not to my mind very high. As a well water pool owner who has to use sequestrant to avoid iron staining, mine have built up to more than 10x that and I've never had an algae outbreak.

    Sequestrant breaks down over time, via chlorine oxidation, for example, into phosphates, both in municipal water systems that use it to prevent corrosion, and in pools where owners or techs apply a stain and scale treatment that is phosphonic acid based.

    In my case, since I trucked in fresh water last year during a liner change, I'm of a mind for annual or seasonal removal just to avoid the kind of build up I had before. But your mileage may vary. Its a personal choice, and IMHO, not critical, particularly at those levels. I went years with no harm
    In ground vinyl Grecian, 24k gal, Hayward 220t sand filter, VGreen VSP 165, Hayward SWG, Raypak NG 265k heater, dolphin m4.
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    Mod Squad YippeeSkippy's Avatar
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    Re: High Phosphates

    If Leslie's Pool Store can't find anything bigger to sell you the cure for, they pull out the Phosphate Scare Card and scare you about phosphates.

    Ignore them. In fact, stop going to a pool store for testing. The only way to get good testing you can trust is to do it yourself.

    TF-100 using Taylor reagents, or the K-2006 test kit bot available via tftestkits.net

    Yip
    Maddie :) 12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
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  5. Back To Top    #5

    In the Industry

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    Re: High Phosphates

    Phosphates are in fact algae food, no algae, who cares about the food. Algae enters your pool every day, wind, rain, run off, it happens. If phosphates are present that algae can grow quicker. Any reading over 3000 ppb is considered minimally high.

    But

    one bottle of phosphate remover will rarely remove more than 300 ppb, more often the results only show a drop of around 150-200 ppb. So just how much and how often you will have to remove it is anyone's guess. Pool stores love selling it. Every tests they do shows it. Anyone who follows the cya/Chlorine ratio will never be able to point a finger at phosphates.

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    Mod Squad tim5055's Avatar
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    Re: High Phosphates

    What you can't see behind the counter at the pool store:

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