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Thread: What is this exactly?

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    Join Date
    Jul 2016
    Location
    Brick NJ
    Posts
    1

    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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    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,077

    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.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Join Date
    Jun 2015
    Location
    Raleigh
    Posts
    357

    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
    SWG
    Variable Speed Pump
    Sand Filter

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    TFP Guide

    Catanzaro's Avatar
    Join Date
    Jul 2014
    Location
    Monmouth County, New Jersey
    Posts
    2,173

    Re: What is this exactly?

    RSA777:

    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
    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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