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Thread: Recurring metal stains

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    Join Date
    Mar 2010
    Location
    Ridgeway, SC
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    25

    Recurring metal stains

    Here's the cycle I've been in this year....

    Notice metal stains, reduce chlorine, apply ascorbic acid treatment, shock (pool store chems) to get chlorine back up, notice metal stains, reduce chlorine, ascorbic acid, Pool store shock, etc.....

    What I've done: after last AA treatment, added Jack's Purple Stuff as sequestering agent; decided pool store shock might be culprit; committed to BBB, TF Test Kit analysis, TFP "How to Shock Your Pool" methodology.... having completed shock using TFP recommended steps, this morning I notice..... STAINS! I really don't want to continue this cycle. Any ideas?

    Current chemical analysis:

    FC - 21 (sustained shock level...expect that to come down in sun )
    CC - .5
    Ph - 7.5
    TA - 100 (down from 190)
    CH - 410 (down from 800+)
    CYA - 80
    Borates - 50

    Thanks!
    17,000 gal fiberglass. 1.5hp pump, Pentair 60 sf DE filter and Pentair IC-20 SWG, TF Test Kit, BBB

  2. Back To Top    #2
    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    Location
    SW Indiana
    Posts
    9,085

    Re: Recurring metal stains

    The sequestering agent doesn't last forever. You probably need a new dose around monthly.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  3. Back To Top    #3

    Join Date
    Mar 2010
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    Ridgeway, SC
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    Re: Recurring metal stains

    Yeah, I've actually added, per Jack's instructions, weekly....
    17,000 gal fiberglass. 1.5hp pump, Pentair 60 sf DE filter and Pentair IC-20 SWG, TF Test Kit, BBB

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    JasonLion's Avatar
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    May 2007
    Location
    Silver Spring, MD
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    37,879

    Re: Recurring metal stains

    Stains return if you aren't using enough sequestrant. Any time the stains return, you should increase the amount of sequestrant you use in the next cycle.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  5. Back To Top    #5

    Join Date
    Mar 2010
    Location
    Ridgeway, SC
    Posts
    25

    Re: Recurring metal stains

    Will the sequestrants affect any of my other readings?
    Thanks!
    17,000 gal fiberglass. 1.5hp pump, Pentair 60 sf DE filter and Pentair IC-20 SWG, TF Test Kit, BBB

  6. Back To Top    #6
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Recurring metal stains

    Most sequestrants lower the PH when they are added, some do this more than others. Some consume chlorine for a day or two, how much varies. Once they have been in the water for a while they shouldn't affect the readings.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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