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Thread: Low CH

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    Low CH

    Pool store person said may need to add calcium increaser if level is too low. (haven't tested mine yet as trying to just clear it up right now). He said if there is not enough calcium in water that it will be pulled from "wherever" it can, like the liner and make it brittle.
    I have read on here that calcium hardness does not matter in a vinyl liner. Why is that? and is he feeding me "pool store" Poo?

    27x54 AGP with Waterfall, 18,500 gallons, Waterway Sand filter- Waterway 1.5 hp -1 speed pump , TF-100 test kit, BBB method.

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

    Re: Low CH

    Yep, he's feeding you a line.

    I've had zero (yeah, you read that right, ZERO) CH (Calcium Hardness) for as long as I've owned the pool and the liner is still as supple and flexible as it was new. And that's been about 5 years.
    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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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Low CH

    What he meant was "I need to sell you something."

    Don't fall for high TDS/Nitrates/Phosphates either. I've never had mine tested and my pool is crystal clear.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Join Date
    Jul 2012
    Dumfries & Galloway, Scotland

    Re: Low CH

    Low CH in a liner pool is not an issue as there is nothing to erode (no plaster/grout), the water is not corrosive enough to attack metal either so increasing your CH is just an expense you dont need. Only thing I would say it gives you is the flexibility to use Calcium Hypochlorite if you see it at a good price if your CH is low already.
    Stuart Murray
    Scotland UK

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