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Thread: Green-To-Clean Help

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    Green-To-Clean Help

    Until yesterday I had a brown-black swampy pool due to algae and pool cover failure. I went to the local pool store and was encouraged to purchase green-to-clean for the algae because my pH was 8 (FC 0, CC 0, TA 120, CYA 0). I was instructed to add it, followed by 2 bags of calcium hypochlorite, wait 12 hrs and add another bag, and repeat in another 12. The pool water didn't do anything with the chlorine application; no FC and continued to smell like sewage. My thought was with no FC either the algae is really feasting or it's so contaminated it can't hold a level with such minimal chlorine added (logical to me). I called the pool store and got an unsure answer so I preceeded to add an additional 7 bags of shock. Pool water is now a different shade of milky green but continues to smell bad and shows no FC (pH is still 8+). Unfortunately, I will have to wait until tomorrow to check CC. So what's the deal with the minimal amount of shock that is supposed to be added over 24 hours? My swamp and that amount didn't compute.
    24' rnd AG,15k gal, 150# sand filter w/Hayward pump

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

    Re: Green-To-Clean Help

    Hi Becky, welcome.

    Please start with this article on Defeating Algae. Then read the other articles in Pool School, like How To Shock your Pool, and you'll have your answer. If you still are uncertain, post back here and we'll assist you.
    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
    Perfectly Clear Pool Service, Find me on Facebook!

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    Rubygrrl's Avatar
    Join Date
    Jun 2009
    Wichita Falls, Texas

    Re: Green-To-Clean Help

    I'm new--but it seems you need to get your CYA up--otherwise all of your chlorine is going to be lost to the sun.
    In-Ground Vinyl Pool
    21,000 gallons
    Sand Filter
    1 1/2 hp pump

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    Join Date
    Jan 2009
    Cupertino, CA

    Re: Green-To-Clean Help

    Quote Originally Posted by Rubygrrl
    I'm new--but it seems you need to get your CYA up--otherwise all of your chlorine is going to be lost to the sun.
    I agree. Maybe get your CYA up to 20 or so (i.e. add about 2lb) while you're whacking the algae, then get it up to 30-50 afterward. (another 2lb).
    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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    Re: Green-To-Clean Help

    green to clean creates monocloramine when chlorine is added. Monochloramine is one of the more common forms of CC. Since it is a nitrogen containing compound the algae consume it and die. It does work but not in cases where you have a stinky green swamp. It works in cases where the algae is from too high a CYA by temporarily taking the CYA out of the loop. However, it's a bandaid and not a fix. In your case you just need a LOT of chlorine until the pool clears. You will actually need more now since you used the green to clean and have to kill the monochloramine you formed than if you had not put it in.
    I would bring the CYA up to 30 ppm and shock to 15-20 ppm and keep it there until the algae is dead. Once the pool is clear and there is no CC you can bring the CYA up a bit higher to 40-50 ppm. With a sand filter I would go for 50 ppm because you will lose CYA with each backwash.

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