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Thread: Calcium hardener expiry date?

  1. Back To Top    #1

    Join Date
    Jul 2015

    Calcium hardener expiry date?

    Hi everyone- I bought a 17 lb bucket of calcium hardener and dumped it in my pool about two weeks ago, left the pump running overnight and water tested at 210 ppm, today I bought another bucket that looked much older and from the sticker that was on it, it seems like it was manufactured in 2009. Does calcium chloride have a shelf life or expiry date? after I poured the recent bucket into the water and had the pump running for about 7 hours I noticed no difference between my test about 2 weeks ago and today, the ppm was around 210-220. any thoughts?
    40k gal, IG gunite, Pentair Sand filter, hayward superpump, K-2006 Test kit. Hayward T15 40k SWG.

  2. Back To Top    #2
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Calcium hardener expiry date?

    Calcium shouldn't have an expiration date.

    Why are you having to add calcium to your pool? Is it a new fill?
    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
    Pool School ----- Pool Math ----- TF-Test Kit

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