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Thread: Green water after adding algaecide just filled pool

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    petrocomical's Avatar
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    Green water after adding algaecide just filled pool

    Ok...first off I'm still a newb. I just had a new IG liner installed and used city water the same as last time. My PH was very high at about a 9 and my chlorine was 0 for some reason I thought it would be a good idea to add some Algecide that I've used before from the blue box store that is a preventative. As soon as I started to bring my PH down with Muratic my pool turned green. Clear but very green. I don't want to get pool stored so I came here first.

    My readings now

    FC 3
    CYA 0-10 and building ( stocking is in the skimmer full of CYA )
    CC 0
    PH 7.2 - 7.4
    TA 120
    CH ( have not tested )

    (Aqua chem) algae eliminator is the brand and the ingredients are below:
    Alkyl (50% C14, 40% C12, 10% C16) is listed first
    then Active ingredients dimethyl benzyl ammonium chloride 50%
    other ingredients 50%

    I've used the product before and had good results pool had a very minor green algae bloom and I kept my FC at 5 and one bottle and bam blue sparkly pool. But the last time I used it my water was balanced also.

    Again the water is clear but green but there is a film or sheen on the top that's a brownish color.

    Any advise please?

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    Richard320's Avatar
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    Re: Green water after adding algaecide just filled pool

    It could just be Iron. It's common for pools to turn green when the chlorine hits the water. It usually goes away in a day or two. Concentrate on getting everything balanced and be patient. If the water is crystal clear but just tinted but not cloudy and it doesn't go away in a couple days, then you'll need a metal sequestrant.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    petrocomical's Avatar
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    Re: Green water after adding algaecide just filled pool

    I took a water sample to the pool store and their numbers and mine match up fairly close my TA went down prolly from the muratic addition and my CYA went up but I added that.
    PH 7.4
    FC 1
    CH 150
    CYA 40
    TA 110
    Phosphates 500

    They recommended raising my calcium hardness and a thing of phosfree...they did however recommend giving it 3-4 days with balanced water and see what happens.

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    Mod Squad jblizzle's Avatar
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    Re: Green water after adding algaecide just filled pool

    What kind of Pool do you have? Your signature is blank.

    Forget about phosphates.
    Jason, TFP Moderator
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    petrocomical's Avatar
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    Re: Green water after adding algaecide just filled pool

    Updated sig...thanks for the replies I'm going to keep balance for a few days and see what happens then look to metal sequestrant.
    30K IG vinyl kidney shaped, Pentair Tagelus 60, Hayward 1Hp superpump, Hayward booster pump

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    Mod Squad jblizzle's Avatar
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    Re: Green water after adding algaecide just filled pool

    Your FC is too low for your CYA level, so you are not balanced.

    With a vinyl pool, there is no reason to add CH.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    petrocomical's Avatar
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    Re: Green water after adding algaecide just filled pool

    Thanks for the reply i just finished my fill working on getting the FC up to 4-5 now
    30K IG vinyl kidney shaped, Pentair Tagelus 60, Hayward 1Hp superpump, Hayward booster pump

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    petrocomical's Avatar
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    Re: Green water after adding algaecide just filled pool

    took 3 days but cleared right up thanks Richard320!
    30K IG vinyl kidney shaped, Pentair Tagelus 60, Hayward 1Hp superpump, Hayward booster pump

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