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Thread: How much FC loss with pool covered?

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    Join Date
    Jun 2013
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    East TN
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    How much FC loss with pool covered?

    Going on vacation and decided to just cover pool. I have a timer on pump to run a little everyday with it covered. As it is now without a cover, FC=6, CYA=50, in full sun I loose 2 to 3ppm which would be about 50% loss in a day. Anyone know about what I would loose in FC with it covered with the black tarp like cover?

    I have no idea what to expect but I would guess 1ppm loss in a day. Water temp now is about 90 degrees and Im sure it will get warmer with the cover while Im gone. I have means to add some chlorine every day to keep it steady, but need to know about how much to make plans. There will be no one in the pool so it wouldnt matter if it goes up to shock level, just as long as it dont go down.
    18,000 Gallon Aboveground. Sand Filter with 2HP 2 speed Pump.

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    Smykowski's Avatar
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    Re: How much FC loss with pool covered?

    How long will you be gone?

    With a solar blanket on my pool, CYA at 55, I'm losing 1ppm, or slightly more, per day.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    Re: How much FC loss with pool covered?

    Probably about 5 days. I assume your solar blanket is clear, correct?
    This is the cover Im going to use. It is the winter cover.
    http://www.lowes.com/pd_89890-1003-2...r|1&facetInfo=
    Last edited by easttn; 06-22-2014 at 09:22 PM. Reason: additional info
    18,000 Gallon Aboveground. Sand Filter with 2HP 2 speed Pump.

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    Re: How much FC loss with pool covered?

    I have an opaque cover and if I don't open it then I lose around 0.7 ppm FC per day, but that is with the pool temperature at 88F. The chlorine loss will be a function of temperature and will also depend on the type of cover since some of the loss is from oxidation of the cover. This also assumes there is little or no debris in the pool and that the filter is clean. This is also with the FC at roughly 10% of the CYA level.
    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
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Smykowski's Avatar
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    Re: How much FC loss with pool covered?

    My cover is 8 mm blue solar cover.

    5 days is easy. Bring it to SLAM level, cover it up, and enjoy your vacation.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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