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Thread: Difficulty Clearing Pool after Algae Bloom

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    Join Date
    Aug 2014
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    Kildeer
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    Difficulty Clearing Pool after Algae Bloom

    We had a mustard algae bloom 3 weeks ago. I killed off the algae by shocking the pool with about 16lbs of dichlor. This killed all the algae and turned the water from a bright green/yellow to a flat blue. Since that time I have been unable to get the pool to completely clear. After a week the pool was better, but still extremely cloudy (I could see about 4 ft down. We have a 23,000 gallon in ground pool. CYA 90, Tot and Free chlorine are both 6.5, ph 7.5, Total Alkalinity is 147. My numbers have been essentially in this range for 2 weeks, but the water is not getting any clearer. I have tried numerous things to get the water to clear and nothing seems to work (in fact most things make the problem worse). We have used clarifier, FLOCed, and changed our filter media, but the pool stubbornly stays a flat blue color. There is a white "haze" that is visible suspended in the pool when the water is agitated after it settles over night. There is no sign of any living algae in the pool and I have been diligently watching for it's reappearance. I suspect that we have dead algae particles suspended in the pool but don't know for sure. When I FLOC'd the pool got cloudier, but nothing settled to the bottom. Any ideas for correcting this problem would be much appreciated as I am at wits end.

    Scott

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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: Difficulty Clearing Pool after Algae Bloom

    I am no expert and learning about this myself. I believe a picture of the pool water and I also recommend taking some water out I the pool and placing in a clear clean glass in front of a white sheet of paper to show the water clarity (2nd picture). I take pictures of objects all the time to send out for other purposes. Please post them and also what test kit are you using ?
    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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    Aug 2014
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    Kildeer
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    Re: Difficulty Clearing Pool after Algae Bloom

    pool1.jpgpool2.jpgpoool3.jpg

    requested pictures. I tested the water with my poolmaster DPD kit and also took the water to the poolstore where it was tested with their system which is Bioguard. Numbers were the same...

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