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Thread: Green Pool

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    Sep 2015
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    Green Pool

    I'm trying to get rid of green algae. I have added liquid chlorine. FC is at 7. CYA is at 50. I cleaned the four cartridge filters a week ago before I shocked it. The pool is still green and the filter pressure is staying the same as when I cleaned it last Saturday - 10 psi. The filters are 4 1/2 years old. Do I need to replace the filters?
    Tim

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    Texas Splash's Avatar
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    Re: Green Pool

    Hello Tim and welcome to TFP. It's not your filter really, it's your chemistry. What are you using to test the water? Green = SLAM via Pool School - SLAM - Shock Level And Maintain. With a CYA of 50, your FC needs to stay at 20 until you pass all 3 SLAM criteria. Follow that SLAM page and you will do well.

    - - - Updated - - -

    Post a full set of results with your TF-100 or Taylor K-2006 and it will help us.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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    Join Date
    Aug 2015
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    Petersburgh, NY
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    Re: Green Pool

    Hi Tim,

    As someone who just finished clearing up a green pool, I can tell you that the SLAM process will work. At first, you will need to test your FC level more often (every hour or so). Keep bringing the FC level back up to your shock level, which is 20 ppm, based on a CYA level of 50. It is important to do this often, in the beginning, so the algae does not have a chance to take over. You can use the PoolMath tool to figure out how much bleach to add. I found it to be a useful tool for this process.

    Obviously, this can be hard because you need to have enough time to do this, depending on your schedule. I was able to test early in the morning, and add whatever bleach I need to add to get it to shock level. Then, after work at night, I was able to test 4-5 times before bed time, adding bleach as needed. Weekends worked out much better because I could SLAM the pool all day, during the sunlight hours when your FC level will likely go down the most.

    Good luck!
    - Chuck - My pool: Fiberglass (Aug 2014); 19,324 gallons, 1.5-hp pump; Hayward Sand Filter


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    Catanzaro's Avatar
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    Jul 2014
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    Monmouth County, New Jersey
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    Re: Green Pool

    Quote Originally Posted by Tim S View Post
    I'm trying to get rid of green algae. I have added liquid chlorine. FC is at 7. CYA is at 50. I cleaned the four cartridge filters a week ago before I shocked it. The pool is still green and the filter pressure is staying the same as when I cleaned it last Saturday - 10 psi. The filters are 4 1/2 years old. Do I need to replace the filters?
    Q: How are you testing? Without the proper recommended test kits, it will be difficult to clear the pool up.
    Q: How long have you been trying to get rid of the green algae?

    The SLAM process could take anywhere from 7-14 days depending on how long the algae has been there. Please make sure that you follow the SLAM procedure and not to take any short cuts. You must pass all 3 tests or the problems will surface again. Additions of liquid chlorine should be added frequently to keep the levels at shock level based on your CYA.

    Once you have test results, please post results as follows:

    CYA
    TC
    CC
    CH
    TA
    PH


    Please read over this material!


    Pool School - SLAM - Shock Level And Maintain
    14,700 gallons IG Pool Vinyl Liner - Octal Circulation System
    Hayward Pro-Series 350 LB. Sand Filter Model # S270T - 2" Plumping
    Hayward CL2002 Chlorinator - Hayward Super Pump 2 HP Model # k48m2n111
    Hayward AQR9 SWG 25K Salt Cell & TF-100 Test Kit + Speed Stir
    Gulfstream HE125RA - 117K BTU Heat Pump - Date of Build is 11-2013

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