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Thread: Municipal water & CH

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    Join Date
    Apr 2013
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    Municipal water & CH

    I'm in the process of filling our pool with water from a municipal water source and it looks good so far. I decided to test the pH to see where I'd be and it came out 7.5. Just right. I also decided, out of curiosity, to test for CH. Not a critical factor, as it's a vinyl Intex pool and I plan to use the BBB method, but I do have some CalHypo left over from last season and I was curious about using it and the risk of raising my CH. Well, after using the CH test from my TFTest kit, I finally got some blueish water after close to 50 drops. Is it possible that my water source is in the 500 ppm range? That seems very high to me. I hope I was testing properly. Any thoughts?
    18'x4' AG Intex Ultra Frame, 6,700 gal., assembled new 2013; Mods: Hayward EC50C90 Perflex filter & 1 h.p. PowerFlo Matrix pump, Fiber Clear cellulose D.E. substitute, Hayward H100ID1 100,000 BTU NG heater, a pair of 2'x20' Sungrabber solar heaters via the original Intex 635T pump, grey Hydro Tools through-the-wall skimmer, Confer steps/ladder system & Cover Free chemical pool cover. The Summer of Mods!

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    mas985's Avatar
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    May 2007
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    Re: Municipal water & CH

    If your city gets most of it's water from wells, you might call them, then it is possible to have that high of a CH level. My fill water is over 300 ppm and some of water is surface water so the wells could be much higher.
    Mark
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    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Mod Squad jblizzle's Avatar
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    Re: Municipal water & CH

    That is possible. Try the CH test using the alternative 10ml so each drop is 25ppm and see what happens:
    extended-test-kit-directions-t25081.html#p206396
    Jason, TFP Moderator
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    Feb 2008
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    Denton, TX
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    Re: Municipal water & CH

    Very possible, yes. And the CH of municipal water can and does vary throughout the year, depending on the various sources that your city gets its water from. It isn't always from the same lake or impoundment. Sometimes, there are 3 or 4 different ones that they use.

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