Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 9 of 9

Thread: drain and acid wash

  1. Back To Top    #1
    Guest

    drain and acid wash

    I do not have pics, but found these from another post that could have been taken at my pool. Here is the link, I hope it works!
    stubborn-dirt-stains-t39348.html
    Anyway, dirt colored stains that showed up over night - literally -
    numbers are:
    FC 8
    CYA 200
    TA 80
    PH 7.2
    copper .5
    Iron .15
    TDS 3200
    We are thinking the only solution is drain and acid wash - is that correct?
    We were told to do a 3-1 ratio for the wash - but are wondering if there is anything other than MA that we could use.
    Any direction - advice?

  2. Back To Top    #2

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,078

    Re: drain and acid wash

    Anyway, dirt colored stains that showed up over night - literally
    I haven't looked at the pic but calcium scale doesn't show up overnight.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,342

    Re: drain and acid wash

    With a copper of .5ppm it's not a surprise you have staining.
    And with a CYA of 200 a drain is needed anyway.

    How do you chlorinate your pool?
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  4. Back To Top    #4

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,078

    Re: drain and acid wash

    Yep, Bama has it correctly surmised, I think!

    The only puzzle I would have is if the stains really were overnight.....I don't think copper can precipitate that quickly.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  5. Back To Top    #5
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,342

    Re: drain and acid wash

    They also have iron of .15 ppm and if they're chlorinating with bleach and happen to dump it in the evening raising the FC will quickly cause staining from that. Though it looks like they have an SWCG.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  6. Back To Top    #6
    Guest

    Re: drain and acid wash

    No, it's not salt, it's chlorine.
    I had a little staining on my steps, which I thought was dirt, as it was only in the corners, but then literally, overnight it covered the rest of the pool. We had a bad dirt storm and had to vigorously back wash - then the auto fill kicked in. We shocked that night there it was the next morning, through the whole pool. I thought it was dirt from another storm, but realized that the cleaner wasn't picking it up and the brush did nothing. That's when it dawned on me that it was staining.
    So, we have come to terms with draining and acid washing, but just really need to make sure that we are doing it correctly.

  7. Back To Top    #7
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,342

    Re: drain and acid wash

    That's a perfect scenario for iron staining. Lots of high metal fill water then shocking with lots of chlorine. That'll cause it to show up overnight.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  8. Back To Top    #8
    Guest

    Re: drain and acid wash

    So, where can I learn about how to do the acid wash properly? Or is there something else I need to do for the iron stains?

  9. Back To Top    #9
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,342

    Re: drain and acid wash

    There are several acid washing topics here. There are a couple ways to do it so I suggest reading up on them and deciding which works best for you.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

Posting Permissions

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