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Thread: Adding bleach in spring before opening?

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    Firebird's Avatar
    Join Date
    Mar 2010
    Northern NJ, USA

    Adding bleach in spring before opening?

    After opening to a major swamp last spring, I looked for advice on preventing the same from happening this year. A local service guy told me to add 6 gallons of clorox in the spring, three at each end. So as soon as the ice was gone in the middle of March I peeled back the cover and added two 182oz bottles at each end, stirring with a 2 by 4 to distribute it as much as possible. I also went out on my own and put 4 trichlor pucks in a floater and tossed it in (anchored with a string and kid's toy to keep it away from the vinyl liner) but I really had no idea how much chlorine that would add or how long it would take to dissolve, just wanted to make sure algae wouldn't have a chance.

    A month later in mid-April the water was still just below 50 degrees, the pucks were basically gone from the floater, and the chlorine level near the surface was 12ppm (CYA near zero). Yesterday the chlorine level was down to 6ppm. The mesh looploc-type cover does let some light in.

    Having leared alot here I'm now wondering how dumb this was... 6 gallons of 6% bleach would add 15ppm chlorine, and the four 8oz pucks added another 8? which isn't crazy but it's unknown what the level was at the bottom of the deep end if the bleach pooled down there. Did I shorten the life of the liner for nothing? Is it smarter to just open early if you see green? Or use polyquat first thing in the spring?

    On the plus side I'm getting ready to open and have to say the water is super clear!

    26,000 gal vinyl inground, Jandy 1.5hp stealth pump, Jandy DEV60 DE filter
    Jandy 115k btu heat pump, Jandy AquaPure 1400 SWG, Polaris 380 cleaner

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Adding bleach in spring before opening?

    Adding chlorine without good circulation is a risk, but there is almost never any damage from a single application. If you do need to add chemicals when the pump isn't working, the best thing to do is to brush the entire pool. That will mix things up enough.

    With a mesh cover it is best to open by the time the water gets to 50 degrees. If you can't do that, the trichlor floater is a good approach.
    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

  3. Back To Top    #3

    Join Date
    Jun 2008

    Re: Adding bleach in spring before opening?

    Algae does not grow fast when the water temperature is less than 60 degrees.

    This spring when the water temperature hit 60 degrees I added polyquat that I purchased on sale last fall. After the local pollen season I opened the pool to no algae. I maintained a shock level for 48 hours to kill bacteria and ensure that there was no hidden algae.

    This year was the least work spring opening for our pool.
    30,000 gallon gunite in-ground with a spillover spa, Diving board and water slide
    Hayward 1 HP Super II filter pump, Hayward 24 " Sand Filter Pro Series using zeolite media
    Polaris 380 cleaner with ¾ HP booster pump, Hayward Heatmaster pool heater, AutoPilot DIG-220 Power Supply SC-60 cell
    Testing with the TF-100 Test Kit

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