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Thread: Green substance in pool after backwash

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    Green substance in pool after backwash

    Very new to the pool world. Have a 24 ft above ground pool and was trying to vacuum for the first time. I have a salt water system and with the vacuum still in skimmer and the filter still running, I switched to backwash. When I switched back to filter there was a green substance flowing out of the return fitting. Now my pool is a cloudy green. What is it and what do I do? Thanks

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    linen's Avatar
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    Re: Green substance in pool after backwash

    Welcome to tfp, Joseph71908

    Did you do a put the valve to rinse and pumped till sit glass was clear, before returning to filter?

    Green coming from the filter is likely algae, how did the pool look before you dumped the green into it?

    If it is algea, then you need to do the shocking process.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Green substance in pool after backwash

    No I didn't. It was a mistake so I just switched it right back to filter. Could there be algea ready in the hoses; I've only had the pool dor 2 weeks?

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    Mod Squad Bama Rambler's Avatar
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    Re: Green substance in pool after backwash

    Welcome to TFP.

    If you didn't stop the pump when switching the valve you have probably dislodged the spider gasket. That will cause dirty water to return to the pool.

    How are you chlorinating the pool?
    Do you have a set of test results that you could post?
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Green substance in pool after backwash

    My ph level is right at 7.2 and my free chlorine is at about .5 to 1.0. My salt ppm is at 3100. Is it safe to swim? I also got all the green out of pool. Salt water system is what i have. Thanks again

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    Re: Green substance in pool after backwash

    It is not flowing greenish looking water anymore since last night and the pool is clear.

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    linen's Avatar
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    Re: Green substance in pool after backwash

    Post a full set of test numbers...especially cya. You should not let your FC get that low.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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