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Thread: To sequester or not??

  1. Back To Top    #1

    Join Date
    May 2016
    Newnan, Georgia

    To sequester or not??

    Okay, so I kept chlorine going all winter, but honestly didn't keep the pool balanced otherwise. 😢
    So, I noticed that the steps were beginning to turn brown. My chlorine had been a tad low, so I shocked the pool. Nothing changed, if anything, it spread. I took a water sample to the pool folks and they said I had no iron or copper. They had me balance everything, but drop chlorine level, then do ascorbic acid treatment.

    I used 2 lbs and it lifted some and just streaked in other areas. I let the pump run for 2 days, back washed quickly, then added more AA. The pool is now the cleanest and clearest that it's ever been. Okay, so the pool folks told me that, since it wasn't metals, I shouldn't use a sequestering agent. I tested tonight and chlorine is 0, pH is 7.2 and TA is actually a bit high, at 1100. I began increasing my chlorine slowly, as told, which is my chlorinator set at 3.

    Here's my concern. Although I was told no sequestering agent, everything here says that I should be using one. I am afraid of the stains coming back and don't want to mess this up. I also see a clear film, in my skimmer. I assume it's from the AA, but have never seen it before. What is it and what should I do from here?

    Any help would be greatly appreciated!

    18x36, 26,000 gallons, vinyl liner, chlorine system

  2. Back To Top    #2
    Mod Squad Texas Splash's Avatar
    Join Date
    Jun 2014
    South-Central Texas, Marion/San Antonio

    Re: To sequester or not??

    Hi Julie and welcome to TFP! Well, you're correct about needing sequestrant IF you have metals. One problem is the pool store's testing can be inconsistent at best, however metal testing is one we often have you go there for. But if you took a sample from your pool water, it may have given a bad results as the metal had already precipitated from the chlorine. I would suggest having the metal tested from the source .... right from where you get the water (garden hose, etc). That may provide a different reading.

    For the rest of your levels, you'll need your own proper test kit, because before doing any metals treatment you definitely need to ensure your water is algae-free, otherwise you'll be right back doing the whole thing over and wasting your money. Please see the TF-100 link below in my sig. Also, here is the TFP Pool School - Metals in the Water and Metal Stains page just in case. Keep in touch and let us know how things are going or if you have any more questions. Have a nice day.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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  3. Back To Top    #3
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    DFW, TX

    Re: To sequester or not??

    If AA removed the stains then the stains were caused by metal, either copper or iron. You can try this product to identify the source, Jacks Magic Stain Identification Kit JMSTAINID at Sunplay
    TFP Moderator
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  4. Back To Top    #4
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: To sequester or not??

    Yes, sequester.

    What has happened is that the Ascorbic Acid has bound itself to the metals. Currently, they are sequestered, so the store test showed none. Sequestrants are like the hard candy shell on M&Ms. The chocolate's still there, you just don't see it. If the pH gets shoved too high, it'll reappear unless you wrap a better shell around it.

    I always like this picture. Look at it closely. Yellow Stains
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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