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Thread: Keeping FC high?

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    Keeping FC high?

    According to the charts with a cya level of 60, my min FC is 5 and target FC is 7. Is there any reason not to run it on the high side? Maybe consider 7 as the minimum and try to keep it floating between 9 and 12?

    The cost should be the same to bump it up a few points whether it is from 5 to 8 or 9 to 12, and I would feel a little safer considering my month long fight with mustard algae. I also think it would compensate for any errors I may have made reading the cya test.
    10.5K gallon, AG vinyl, Hayward EC40 DE filter

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    Richard320's Avatar
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    Re: Keeping FC high?

    You don't lose a fixed PPM per day to sunlight, rather it's a percentage. So you will use a teeny bit more bleach at the higher FC. That being said, it's cheap insurance. I always pad my FC level, too.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Join Date
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    Re: Keeping FC high?

    You can make your target 8 or maybe 9 but I wouldn't go higher than that. As long as you don't drop below 5 though, you should be ok.

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    Re: Keeping FC high?

    Those were my thoughts exactly. I would rather use a bit more bleach and reduce the chances of a problem. I am more concerned with crystal clear water than running things as cheap as possible. This way I shouldn't ever have to worry about dipping below the minimum.

    Are there any negatives to keeping it high? I am doing damage to the vinyl liner or anything in the pump?
    10.5K gallon, AG vinyl, Hayward EC40 DE filter

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    Join Date
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    Re: Keeping FC high?

    Keeping your FC higher than needed can bleach hair and swimwear.

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