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Thread: Pool cover during SLAM

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    Jezza's Avatar
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    Pool cover during SLAM

    I am currently in the process of slamming my pool. I have been going for 4 days and now into the 5th day. My question is regarding the use of a pool cover during the process. Due to a low level of Cya, pitching at 30, my theory is by using the pool cover during the day I can reduce the loss of chlorine due to sunlight while shocking. The pool is crystal clear and has been the whole time, consistent recordings of 0.5 CC. My OCLT recordings are failing by drops of 2.5 to 2.0 FC over the course of the 4 days (2.0 drop last night)and have kept the pool cover on for the past 2 nights. Should I take the pool cover off during the OCLT for a more reliable reading.? Also just wondering what a reasonable time frame for passing the OCLT would be keeping in mind the information provided?
    11 000 gallons, IG, Fibreglass, Monarch Sand Filter, Davey Typhoon C100M 1HP pump, Davey Chloromatic Mc16CTO ESR SWG, Davey Pool Wall Climba Robot, Daisy Solar Cover,
    K-2006

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    Re: Pool cover during SLAM

    There is no point in putting the cover on at night. Chlorine is consumed by.....

    1. Organics in your pool water

    2. UV light from the sun

    That's it so there is no loss from UV at night and subsequently no need to cover the pool.

    Honestly, I don't like the cover on the pool at all until the SLAM is complete. Pools like to breathe and the exposure to UV also helps in removing any buildup of cc's you might have. Also, the affect of high FC on any cover is not great and, I know you're not using solar covers, but is quite degrading to them.

    I think what ever you save in FC loss is offset by the trouble of putting the cover on and the (low) possibility of some side effects.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Casey's Avatar
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    Re: Pool cover during SLAM

    Take it off!
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

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    Re: Pool cover during SLAM

    Ok pool cover is off. Just wondering roughly how long to pass the OCLT based on last nights loss of 2.0ppm and other information provided.
    11 000 gallons, IG, Fibreglass, Monarch Sand Filter, Davey Typhoon C100M 1HP pump, Davey Chloromatic Mc16CTO ESR SWG, Davey Pool Wall Climba Robot, Daisy Solar Cover,
    K-2006

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    Re: Pool cover during SLAM

    Quote Originally Posted by Jezza View Post
    Ok pool cover is off. Just wondering roughly how long to pass the OCLT based on last nights loss of 2.0ppm and other information provided.
    Wish I could tell you, but it's different in every pool. Depending on how bad the water was when you started, expect several more days perhaps. If it was pretty dark green or nearly black, it usually takes a couple of weeks and more.
    TFP Moderator
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    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

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    Re: Pool cover during SLAM

    Water was crystal clear and no visible signs of algae in the actual pool, found some serious algae in the light niche 2 days into the SLAM of which I eradicated with chlorine
    11 000 gallons, IG, Fibreglass, Monarch Sand Filter, Davey Typhoon C100M 1HP pump, Davey Chloromatic Mc16CTO ESR SWG, Davey Pool Wall Climba Robot, Daisy Solar Cover,
    K-2006

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    Re: Pool cover during SLAM

    Quote Originally Posted by Jezza View Post
    Ok pool cover is off. Just wondering roughly how long to pass the OCLT based on last nights loss of 2.0ppm and other information provided.
    I'm 16 days into a slam. I rarely lose more than 2 ppm per night and just a touch cloudy in deep end. But there is something that just won't die. So it could be a while more, even with that small overnight loss. Good luck!
    Sand filter
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    25000 gallon IG Vinyl

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    Re: Pool cover during SLAM

    Yay passed the oclt with overnight loss of 0.5 so I guess I'm finally done. Keep at it Rere. I've gained so much knowledge from the forum and various posters on this site and can't speak highly enough about the friendly advice that is given. It certainly has opened my eyes up to what's involved in running a pool.I'll certainly be recommending to my friends over here in Oz.
    11 000 gallons, IG, Fibreglass, Monarch Sand Filter, Davey Typhoon C100M 1HP pump, Davey Chloromatic Mc16CTO ESR SWG, Davey Pool Wall Climba Robot, Daisy Solar Cover,
    K-2006

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