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Thread: Chlorine and solar blanket

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    Chlorine and solar blanket

    I was overzealous in my chlorine use when we first opened as I knew I wouldn't have time the first few days to take care of the pool as I should (but had only one window of opportunity in which to open within the next 5 weeks). As it is, my CL level is high...13 range. I will post the other levels tomorrow..but they are not bad...TA on high side. I want to cover the pool with new solar blanket. If I cover it now, will the Cl eat a hole through it, or at what level should I let it drop to just to be on the safe side? Want to take advantage of the warm days coming up. Thanks.
    22,500 gal A.G., vinyl, sta rite cristal sand filter & pump (1.5 h.p.), BBB method

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Chlorine and solar blanket

    First thing is that you're not going to eat a hole in it. We really need to know the CYA level to give you an accurate answer but even with a CYA level of 20 you'll be fine to put the cover on.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Chlorine and solar blanket

    I guess I didn't mean literally eat a hole through it- I just knew that the chlorine does speed up the process of breaking them down, so didn't want to start off on the wrong foot, or didn't know if it's not a good idea for some other reason to cover the pool with such high CL levels. The CYA is around 75..still hard for me to get a good handle on when the black dot actually disappears. I plan to leave the blanket is on 24/7 till the water temp is 'swimable', with the exception of cleaning, etc. Any problems with this, as it seems like the Cl level has remained around that level for a week..with only slight drop.
    22,500 gal A.G., vinyl, sta rite cristal sand filter & pump (1.5 h.p.), BBB method

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    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Chlorine and solar blanket

    If you shock at the recommended level where the FC is around 40% of the CYA level, then this is roughly equivalent to having 0.6 ppm FC with no CYA. Compare this with the minimum level of chlorine for manually dosed pools which is an FC of around 7.5% of the CYA level which is equivalent to having around 0.06 ppm FC with no CYA. So roughly speaking, the shock level of chlorine would react about 10 times faster than the minimum chlorine level. So every day of exposure to your cover at shock levels is roughly equivalent to 10 days of exposure at the minimum chlorine level. Unless you were going to be shocking for a long time, you probably won't notice a difference in cover life. Even shocking for a week means perhaps 2 months of shortened life.

    The above assumes ideal circulation and in practice when the pump is off the circulation is poor so the chlorine near the cover gets partially used up (and diffusion is rather slow) and the degradation rate slows down until the pump comes back on to recirculate the water.
    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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    Join Date
    Jan 2009
    Cupertino, CA

    Re: Chlorine and solar blanket

    So, in practice it's not a problem and you probably won't be able to tell the difference over the life of the cover, because the lifetime of your cover isn't that predictable in the first place.

    Now, if you kept the FC up that high all the time, yes you'd notice the difference and your covers would degrade pretty rapidly.

    I will add that with the cover on, you should expect the FC to drop less quickly than it would with the cover off.
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

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    frustratedpoolmom's Avatar
    Join Date
    May 2007
    SWSuburban Chicago, IL

    Re: Chlorine and solar blanket

    Keep an eye on your PH level if you leave the cover on - it tends to drift down when the cover is on along time.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner

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