Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 6 of 6

Thread: Something is wrong

  1. Back To Top    #1

    Join Date
    Aug 2015
    Location
    Easton, PA
    Posts
    4

    Unhappy Something is wrong

    I have SWG pool. 25k gallon. Just tested levels
    FC-1.5
    TA-120
    PH-8
    Calcium-200
    CYA:30-50

    Had a heavy rain a couple of days ago, so added some shock. PH a little high, so added some muriatic acid right after shock. A couple of minutes later I noticed a dark "stain" at the bottom of the pool. It followed the path I poured the shock and acid. I tried brushing the stain, but nothing. It appears that the shock and acid had a reaction and settled at the bottom of the pool. I have added the shock and acid before in this manner and have not had an issue. Why would this happen? Will the stain go away? Is the pool safe to swim in? Very concerned about this. It is an in ground, Gunite pool. Any insight is greatly appreciated!!!
    Pool size: 25k gallon
    Inground pool
    Gunite
    aqua rite SWG

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Something is wrong

    Welcome to TFP!

    What is shock?
    How are you testing?
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  3. Back To Top    #3

    Join Date
    Aug 2015
    Location
    Easton, PA
    Posts
    4

    Re: Something is wrong

    Shock- HTH brand (47.6% calcium hypochlorite)
    Tester - used HTH 6 way test strip and Taylor DPD chlorine tester. Both read ~1.5 ppm.

    I just read something that suggested that calcium hypochlorite mixing with metal (copper or iron) could turn a pool surface bottom. Could this be the issue? I have never had an issue with metal in my pool before.
    Pool size: 25k gallon
    Inground pool
    Gunite
    aqua rite SWG

  4. Back To Top    #4
    Mod Squad YippeeSkippy's Avatar
    Join Date
    Jan 2012
    Location
    'burbs of Augusta, Georgia
    Posts
    6,479

    Re: Something is wrong

    Re: Stain-Ever put algaecide in the pool?

    Why is your FC so low? It should be higher whether your CYA is 30, 40 or 50. What is is exactly?
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
    Our pool build--> Our Pool Solved Our Sloping Yard Skippy's Cheap Pool Cooler -->Skippy's New Fountain

  5. Back To Top    #5

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,081

    Re: Something is wrong

    Well, it's 20-20 hindsight but NEVER add chemistry like that. Always add it in front of a return (pump running).

    So the Cal-hypo was a powder....did you make a slurry before you poured it?

    The muriatic acid was 31.45%, correct?

    That problem has not been reported here before but I don't remember it being done back to back in those apparent concentrations.

    The pool is certainly safe to swim. The worst case is the acid damaged your pool surface and the stain is permanent. Best case is it may go away in a few days. I can't think of anything you can do now to fix it either way.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  6. Back To Top    #6

    Join Date
    Aug 2015
    Location
    Easton, PA
    Posts
    4

    Re: Something is wrong

    Good news. The stain disappeared. Was worried for a minute. Thanks for the comments everyone. I will definitely take Dave's advice and NOT add chemistry like that again!
    Pool size: 25k gallon
    Inground pool
    Gunite
    aqua rite SWG

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •