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Thread: Green Pool

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    Green Pool

    I have an above ground 18 ft. wide and 52in. deep. We have a salt water pump along with the regular pump that came with the pool. I tested the water yesterday evening and everything checked out ok except for the PH level was way too high. This morning got up and the pool was green. What is the best way to get rid of the algae in the in the pool and get the PH level down?

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    dattia's Avatar
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    Re: Green Pool

    You need to shock your pool. We are advocates of using liquid chlorine (bleach) for this process. There is a "How to" article on shocking in Pool School (button located top right of your screen). During the process, it is critical that you have a good test kit. You said that you have tested the water, what kind of test are you using now?
    27' round AG
    Hayward Matrix 1 1/2 HP Pump
    Hayward S210T Sand Filter

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    Re: Green Pool

    I'm using the test strips that came with the pool, that test the FC, pH, and TA. I was going to go by the pool store here shortly and get a better test kit.

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    dattia's Avatar
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    Re: Green Pool

    Most of the pool stores around me do not carry a test kit that is adequate for the shocking process recommended here. Shocking requires adding bleach to reach levels far beyond what most of the ordinary test kits can measure, so I would recommend getting a kit with the FAS/DPD to measure FC. There is one available through this site and there is another made by Taylor. Having a good test kit will put you in control of your pool, and once you get past the shocking phase... maintenance is usually a breeze with the methods described here. I was 'pool stored' for one season and never had any idea what was really going on with my pool. Since I came to TFP, I have never looked back.
    27' round AG
    Hayward Matrix 1 1/2 HP Pump
    Hayward S210T Sand Filter

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    Re: Green Pool

    With shocking the pool, should that bring the pH level down as well?

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    dattia's Avatar
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    Re: Green Pool

    No, you will have to lower your pH with Muriatic Acid, or you can buy a pool product called pH Down or pH minus. That's what I have always done as handling muriatic acid scares me a bit, but the pool product is probably just the same thing with a different name.

    Information on this is also found in Pool School in the article ABC's of Pool Water Chemistry.
    27' round AG
    Hayward Matrix 1 1/2 HP Pump
    Hayward S210T Sand Filter

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    Butterfly's Avatar
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    Re: Green Pool

    Hi Thickey and welcome to the forum

    Shocking the pool will NOT lower your pH. Use muriatic acid to lower your pH.
    Lower the pH to about 7.4ish before you start the shock process.

    You should start reading Pool School ASAP and getting a idea of what is needed.

    The test kits we recommend are listed/compared in Pool School. The fav around here is the TF100 from http://www.TFTestKits.Net
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: Green Pool

    I received my TF 100 kit today and tested the pool.
    FC 8
    CC .5
    TA 180
    CH 190
    CYA 30

    The pool still has a green tint to it. What is the best way to get TA down.

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    JasonLion's Avatar
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    Re: Green Pool

    The simplest thing to do about TA is to lower the PH to 7.2 every time it gets to 7.8. If the PH goes up annoyingly quickly, follow the directions on lowering TA in pool school.

    Is the water a clear sparkly green? Or more of a dull slightly hazy green?
    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

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    Re: Green Pool

    It's more of a dull slightly hazy green.

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    pepsiholic's Avatar
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    Re: Green Pool

    Since you have recieved your test kit have you lowered your ph? If not go ahead and lower it to about 7.2. Then test your chlorine. After you get a chlorine reading use the pool calculater to add enough chlorine to get it to your recommended shock level, which I believe is around 12 or 13. Wait an hour and test again, bring the chlorine back up to shock level every hour or so if you can. Read the section of pool school on how to shock you pool, very informative.
    24 x 52 Round AG Outback Empire Pool 13,500 gal.
    1 HP Hayward Power-Flo pump w/Hayward 18" 150lb. sand filter
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    Butterfly's Avatar
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    Re: Green Pool

    Yep, sounds like algae.

    Here's the link to how to shock your pool:
    pool-school/shocking_your_pool

    You are done shocking when you meet three criteria.
    See red lines in my sig.

    Congrats on your new TF100. You can now take control of your pool!
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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