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Thread: Acid Washing

  1. Back To Top    #1

    Join Date
    Apr 2015
    Katy, TX

    Acid Washing

    I have had my pool for over 6 months now and I have balanced my pool the TFP way. I test it regularly to make sure I'm balanced. Last week, I noticed more white spots on the floor of my pool and steps. I called my PB, who came to my pool and told me that my pool looks good. He said I was doing everything right and sometimes these things happen. He was talking kind of fast but basically he told me he needed to add acid to my pool. I asked him if it was called acid washing and he said no. He told me what it was but I forgot.

    Two days ago, he came by and turned off my pool equipment. He put some kind of pump into my pool and plugged it into an outlet. He poured 6 gallons of MA into my pool. Today, he removed the pump and turned my equipment back on. Unfortunately, I was at work so I couldn't talk to him. I will call him tomorrow to ask questions.

    The pool looks a whole lot better. There are still some white spots but most of it is gone. So I then tested the water and my numbers are off. My question to you guys is regarding CH. My CH is 380. Is it ok to leave it at this level? I know the range is 250-350 so I'm not that far off but I'm just trying to make sure the white spots don't come back again.

    Also, does anyone know how I got the white spots and how I can prevent it from coming back? \

    My numbers prior to the "acid wash":
    Cl: 5.0
    pH: 7.6
    CH: 300
    CYA: 40

    My numbers after the "acid wash":
    Cl: 0.5 (I was told not to add Cl during the process. As soon as he was done, I added Cl)
    pH: probably less than 7.0 (Taylor test kit does not go below 7.0)
    TA: 100
    CH: 380
    CYA: less than 20 (Taylor test kit does not go below 20)

    Thank you.
    24K gallon, IG, plaster, Pentair Clean and Clear Plus Filter, Pentair Heater, Pentair Intelliflo pump, Built in March 2015, Taylor K-2006, Spa included

  2. Back To Top    #2
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    DFW, TX

    Re: Acid Washing

    Yes, 380 is fine, there are people on TFP who manage CH in the 800-1000 range. Plug all your numbers in Poolmath and keep your CSI in range to avoid it. More here, Pool School - Calcium Scaling
    TFP Moderator
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