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Thread: Green algae turned brown

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    benavidescj's Avatar
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    Green algae turned brown

    Putting this post in for a friend:

    He has a IG Vinyl pool, 18K, Sand Filter, 1hp pump

    Here are the readings last night:
    FC: 4
    TC: 4
    pH: 7k.2
    TA: 100
    CH: 250
    CYA: 80

    This morning:
    FC: 4
    TC: 4
    pH: 7.4
    TA: 100
    CH 250
    CYA: 80

    Last week he went on vacation and when he got back he had green algae. When he got back he noticed the pump was clogged with leaves and cleaned the pump, and filter out. The water started moving again. Then he added 5 to 7 gal of bleach and 7 lbs of CYA because his CYA at the time was about 20ppm. He also added about 2 gals of algicide.

    The problem now is it seems the algae is dead (overnight FC test) but the pool is brown. What can he try out to clear up the water?
    Carlos
    Pool: 28,000 gallons IG; IC 40 SWG; Pentair 120 gpm cartridge filter; Marble finish; Pentair Wisperflow 1.5 hp; Polaris 360
    Spa: 350 gallon; Bromine
    How to shock your pool

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    Mod Squad Bama Rambler's Avatar
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    Re: Green algae turned brown

    Keep pumping. Run it 24 hours a day and backwash the filter as needed. It takes a while to clear even after it's all dead.

    Why is he running his CYA so high? Does he have a SWCG?
    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
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    benavidescj's Avatar
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    Re: Green algae turned brown

    Thanks Bama, I told him what you said. The reason why his CYA is so high is that the pool store told him to put that much in... I know, I know...
    I told him to drain a little off to get it down to around 70ppm. He does have a SWG. I also said he does not have a bottom drain, so in my mind he has no way to efficiently get rid of dead algae below the skimmers. He said he has a pipe that he can hook up that will setup a bottom drain. I told him to try that out so he can increase the filtering efficiency.
    Carlos
    Pool: 28,000 gallons IG; IC 40 SWG; Pentair 120 gpm cartridge filter; Marble finish; Pentair Wisperflow 1.5 hp; Polaris 360
    Spa: 350 gallon; Bromine
    How to shock your pool

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    dmanb2b's Avatar
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    Re: Green algae turned brown

    With CYA of 80, any clearing will be offset with another algae outbreak as his FC of 4ppm is too low. Unless he's running a swg, you should advise him to target 7-8ppm FC
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    Mod Squad Bama Rambler's Avatar
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    Re: Green algae turned brown

    What Dman said! Even if he's running the SWCG I'd recommend he keep the FC at 7-8ppm until the water is cleared up.

    If he's getting good circulation from his return(s) he really doesn't need a main drain, but it certainly won't hurt anything to pump from the bottom.
    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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