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Thread: Draining a High CH Pool and Filling with Highish CH Water

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    VegasPoolRat's Avatar
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    May 2010
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    Draining a High CH Pool and Filling with Highish CH Water

    First the numbers, courtesy of my beloved TF-100:

    FC 3
    pH 7.6
    TA 70
    CH 1400(!)
    CYA 40
    Borate 50

    Plaster pool, using the BBB method.

    My CSI is currently .43, but because of my ozonator the pH tends towards 7.8 which moves the CSI to 0.59. Looking directly at the water at a perpendicular looks clear, but looking at an angle with the shine shining in you see a lot of "dust," which I am now assuming to be due to the high CH.

    My fill water has a CH of 200 (Vegas water is awful).

    So my question is: Am I crazy for planning on replacing 100% of the water? I'm not concerned about the cost, but I wouldn't do it if I didn't feel it was necessary. Part of my rationale is that I already did a 100% drain & fill last year about this time, so it didn't take that long for the CH to rocket back up.

    In this vein, I want to confirm it would be a definite no-no to do the water replacement with water from my softener? I believe I would then start off with a CH of close to 0, which would then put my CSI at something close to -2.41.

    It's kind of unfortunate, since thanks to the BBB, all my other levels (CYA, Borates) are very steady.

    Thanks!

    VegasPoolRat
    12K gallon 8' in-ground w/ Hef-style mini-grotto - Pentair IntelliFlo VS-3050 - Pentair Clean & Clear Plus 520 - Pentair MasterTemp 400BTU Heater - UltraPure Oxidizer - Nature2 ProG Mineral Filter (unused) - Pentair 320 Chlorine Feeder (Unused) - A&A In-Floor Max - Pentair Intellitouch i7+3 w/ Mobi and iPhone/PC ScreenLogic - IntelliBrite Color LED x 3 - Intellibrite Landscape LED x 10 - TF-100 Test Kit

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    JasonLion's Avatar
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    Re: Draining a High CH Pool and Filling with Highish CH Wate

    Yes, with CH over 1,000 you need to do something to get the CH level down. Assuming you have a plaster/pebble/quartz/tile pool the best thing is a complete water replacement (or a reverse osmosis treatment if available in your area).
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    duraleigh's Avatar
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    Re: Draining a High CH Pool and Filling with Highish CH Wate

    I want to confirm it would be a definite no-no to do the water replacement with water from my softener?
    Not at all. If you could replace say 70% of your current water with the CH 200 water, you could then start using your softener and manage your CH down to as low as you want. You will use a lot of salt but I would sure consider it.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    VegasPoolRat's Avatar
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    Re: Draining a High CH Pool and Filling with Highish CH Wate

    Thanks guys, much appreciated.
    12K gallon 8' in-ground w/ Hef-style mini-grotto - Pentair IntelliFlo VS-3050 - Pentair Clean & Clear Plus 520 - Pentair MasterTemp 400BTU Heater - UltraPure Oxidizer - Nature2 ProG Mineral Filter (unused) - Pentair 320 Chlorine Feeder (Unused) - A&A In-Floor Max - Pentair Intellitouch i7+3 w/ Mobi and iPhone/PC ScreenLogic - IntelliBrite Color LED x 3 - Intellibrite Landscape LED x 10 - TF-100 Test Kit

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