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Thread: Do sequestrants bind calcium & release it as they degrade?

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    gtemkin's Avatar
    Join Date
    Jun 2008
    Seattle, WA

    Do sequestrants bind calcium & release it as they degrade?

    I've watched my calcium level slowly increase from 280 to 380 over the last month and a half and I was wondering if this can be partially explained by degradation of a sequestrant (Jack's Purple) that was added back then. I've added no water or chemicals other than straight bleach and muriatic acid. The pool has been covered almost all the time except for cleaning, or the 3 or 4 times that my wife used it for lap exercise.

    The finish is relatively new (Oct 2012) and unfortunately had a "light" acid wash to eliminate a large calcium chloride stain at start of that month and a half ago time frame.

    Is the calcium rise due to the normal break-in of a new and/or acid washed finish or am I am I seeing some effect of the sequestrant.

    21K gal 16' x 40' in-ground pool built 1959, old school with Jacuzzi bronze pump, American Products 24" Sand Filter & Americana Multiport valve, Jandy Lite2 millivolt heater, Coverstar cover, and classic Kreepy Krauly.

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Do sequestrants bind calcium & release them as they degr

    Sequestrants do degrade over time and release whatever they're binding back into the water. If you read the instructions you'll see that you have to add manitenance doses on a regular basis. I suspect it may be a combination of the new plaster and the sequestrant.
    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
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