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Thread: What is this exactly?

  1. Back To Top    #1

    Join Date
    Jul 2016
    Brick NJ

    What is this exactly?

    Second year I have run into this. Vinyl pool with high chlorine and good PH. Then this shows up. Water is crystal clear. If I touch these up comes a green puf.
    I don't understand how this appears if I maintain high chlorine levels. Using BBB. I'll have to shock to kill it. I do have many oak trees in the area. Seems to happen once it gets hot and humid.
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  2. Back To Top    #2

    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: What is this exactly?

    That is dead algae settling to the bottom of your pool. You do not provide enough information to give you an accurate answer but I will say that algae does not grow in a pool that has adequate chlorine.

    Can you post a complete set of test results? That will help us give you some educated information instead of just guess work.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3

    Join Date
    Jun 2015

    Re: What is this exactly?

    Once it gets hot the burnoff of FC is accelerated so unless you adjust your chlorine addition to compensate you could be dipping below the minimum FC levels to prevent an algae bloom.
    18' x 38' Pool, 3' to 8' Depth
    Vinyl Liner
    Variable Speed Pump
    Sand Filter

  4. Back To Top    #4

    TFP Guide
    Catanzaro's Avatar
    Join Date
    Jul 2014
    Howell, New Jersey

    Re: What is this exactly?


    Please add your signature so we can understand your pool better. In a properly chlorinated pool, if I had to take a guess, this is either a circulation problem (dead spots) and/or lack of brushing. Brush twice weekly and if you have great success, you may be able to cut back to one time weekly. Keep us posted and welcome to TFP!
    14,700 gallons IG Pool Vinyl Liner - Octal Circulation System
    Hayward Pro-Series 350 LB. Sand Filter Model # S270T - 2" Plumping
    Frog Mineralizer System (EMPTY) - Hayward Super Pump 2 HP Model # k48m2n111
    Pool Company tests water (NO LONGER) TF-100 TEST KIT
    Date of Build is 11-2013

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