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Thread: Phos-free

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    Phos-free

    What is in it? What good does it do? What harm does it do?
    36 x 18 oval pool, inground, plaster pool.
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    Pool built in 1971.

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    JasonLion's Avatar
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    Re: Can Phos-free be used in lieu of shock?

    Phos-Free removes phosphates from the water. If you get the phosphate level low enough, algae usually can't grow as it has nothing to eat. However there are forms of phosphate that are not removed by phos-free, so that is not guaranteed. Phosphate remover tends to cloud up the water. Ideally this clears up quickly, but for some people it can stay cloudy for days. Also, some areas add phosphates to the tap water, which can cause phosphate levels so high that getting the phosphate level low enough is impractical.

    Of course algae isn't the only reason you need chlorine, as bacteria and viruses can do just fine even at extremely low phosphate levels. So you have to have chlorine anyway. If you maintain appropriate levels of chlorine no algae can grow in the water, with or without phosphates. You have to have chlorine anyway, and chlorine alone is sufficient, so why waste time and money on phosphate remover?
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    Richard320's Avatar
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    Re: Phos-free

    Quote Originally Posted by TomAtlanta
    What is in it? What good does it do? What harm does it do?
    Here's just one lengthy thread about phosphates: phosphates-can-be-a-serious-problem-t16805.html?hilit=phosphates

    The search box is your friend. If you look for others using the search box, you might want to limit it to thread titles only to keep the number of posts to only a few hundred.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
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    Re: Phos-free

    Thanks for the link, and the suggestion on how to do a search. I have also been using google to search, adding troublefree pool to whatever I am searching for.
    36 x 18 oval pool, inground, plaster pool.
    27000 gallons
    1 hp pump. Sand filter
    Pool built in 1971.

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    Vette's Avatar
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    Jul 2012
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    Re: Phos-free

    If you want to know whats in it, its Lanthanum, and the first element in the Lanthanide series of "rare-earth" metals, even though Lanthanum isn't rare.
    11,700 gallon 21' round 54" deep all-resin AGP - June 2012
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    Re: Phos-free

    And what it does it to precipitate lanthanum phosphate which is why it clouds pool water unless a clarifier is used (PhosFree supposedly has a clarifier in it for that reason). The precipitate will then get caught in the filter and have to be backwashed or cleaned. Lanthanum chemicals (usually lanthanum chloride or lanthanum carbonate) are expensive so if you have a lot of phosphate in the pool water, it can get expensive to remove.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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