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Thread: Solar cover and high FC

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    Join Date
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    Solar cover and high FC

    My SWCG (Aquapure 1400) was originally set at 50% with no cover and kept the FC at about 5. Once things began to cool down at night (55 degrees), the FC got to about 11. I set the SWCG to 40% and then turned on my heatpump and put on a solar cover which has been on fro about 4 days. My water temp is 82 during the day. After the solar cover was put on, the FC kept climbing to yesterdays number of about 16. I have turned the SWCG to 29%. Is this normal? Should I just turn the SWCG off? I'm concerned about getting algea if I have it off with the cover but I also don't want to ruin my pool equipment with this high chlorine--am I at risk here? Should I just remove the cover during the day?

    The rest of my nummbers are as follows:

    CYA 55
    TA 90
    CH 220
    PH 7.5
    Salt 3400 ppm
    Pump runs about 9 hours per day.
    c ya, grivera

    IG, Cement, 18,600 Gal; DE, SWCG, Nature 2; 1.5 hp pump; Quartz Aggregate, Mid-Atlantic-1st opened 7/07

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    JasonLion's Avatar
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    You need to turn the SWG percentage down more. You need to adjust the percentage reguarly to keep about the right amount of chlorine in the pool. Using a cover dramatically reduces the chlorine demand, so a simiarly large adjustment in the percentage is to be expected.
    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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    Thanks Jason, I turned the SWG down to 19%. At which point in FC level do I begin to damage equipment (pump internals, solar cover, etc.)?
    c ya, grivera

    IG, Cement, 18,600 Gal; DE, SWCG, Nature 2; 1.5 hp pump; Quartz Aggregate, Mid-Atlantic-1st opened 7/07

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    JasonLion's Avatar
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    It is a function of your CYA level, somewhere around double the standard shock level there might be some long term risk to a vinyl liner. Around perhaps four times the standard shock level you might start to have some long term troubles with metals.
    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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    What is the standard shock level for FC?
    c ya, grivera

    IG, Cement, 18,600 Gal; DE, SWCG, Nature 2; 1.5 hp pump; Quartz Aggregate, Mid-Atlantic-1st opened 7/07

  6. Back To Top    #6
    JasonLion's Avatar
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    The chlorine level required to keep the pool sanitary and to kill alage varies depending on the CYA level, see this chart or my Pool Calculator (see the link in my signature).
    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

  7. Back To Top    #7
    Most people report less chlorine usage when the cover is on. It could be that you are adding the same amount of chlorine but are using less so it builds up. Lower your SWG percentage and monitor the CL level.
    20x40 24,000 gal IG plaster/CircuPool RJ45 SWG/2 skimmer/2sp 2.5hp Jandy Stealth/340sq ft cart filter/600sqftHeliocol Solar Panels/6ft semi circlr tanning ledge/25ft deep end bench/5ft sheer descent/2 lion head water features/1300sqft travertine paver/2 Colorlogic lights/Hayward Navigator/3step 2ft raised bond beam

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