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Thread: sequestering agent?

  1. #1
    Senior Member
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    May 2009
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    sequestering agent?

    When is the best time to use a sequestering agent and which one do you recommend? I have a fiberglass pool that has some stains. Do you need to get chlorine down to zero for it to work?

    Thanks
    20,000 gallon viking fiberglass pool w/aqua comfort heat pump, pentair whisperflo pump 1.5hp autopilot dig-220 swg w/RC42 cell (42,000), pg2000 fiber optic lights
    hayward sand filter(medium is echoglass)
    Blue diamond robot cleaner

  2. #2
    Administrator JasonLion's Avatar
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    Re: sequestering agent?

    Sequestrant is designed to prevent stains from forming. It will occasionally remove an existing stain, but it isn't really good at that. You do not need to lower chlorine to zero for sequestrant to work, but you do lower chlorine to zero when doing an AA treatment, which is a good way to remove existing stains.

    Before doing an AA treatment, test a small area by placing a vitamin C tablet on a stained area for 30 seconds. If the stain goes away around the vitamin C tablet, then an AA treatment will work.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    TFP Admin. Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. #3
    Senior Member
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    Re: sequestering agent?

    I am still in the process of balancing my water after opening on sat. Should I wait on the AA treatment till the water is balanced and clear or let the chlorine drop to zero now and go from there?
    20,000 gallon viking fiberglass pool w/aqua comfort heat pump, pentair whisperflo pump 1.5hp autopilot dig-220 swg w/RC42 cell (42,000), pg2000 fiber optic lights
    hayward sand filter(medium is echoglass)
    Blue diamond robot cleaner

  4. #4
    Senior Member whoozer's Avatar
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    Apr 2008
    Location
    Acton Maine
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    632

    Re: sequestering agent?

    Get it cleared first/killing algae etc. then worry about the AA treatment. Make sure algae is dead and cleared because if you don't and do it backwards you will have issues later.
    So clear the pool, check for FC loss of less than 1 over night, sparkling water, and cc of .5 or less. Once you are there you can work on the metal issues.
    Tackle one issue at a time
    14x33 fiberglass freeform
    Variable speed Pentair intelliflo superpump
    420 Clean and Clear Plus cartridge filter.
    pool-school/pool_calculator , http://www.tftestkits.net/

  5. #5
    Senior Member
    Join Date
    May 2009
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    369

    Re: sequestering agent?

    Thanks,will do.
    20,000 gallon viking fiberglass pool w/aqua comfort heat pump, pentair whisperflo pump 1.5hp autopilot dig-220 swg w/RC42 cell (42,000), pg2000 fiber optic lights
    hayward sand filter(medium is echoglass)
    Blue diamond robot cleaner

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