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Thread: Disolving CH

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    botanica37's Avatar
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    Disolving CH

    I have to raise CH from 200 to 300, but...when I broadcast the granules in the deep end, they don't disolve, just settle at the bottom - I brushed and brushed and then brushed some more...they are still not disolving. Eventually they end up in the sand filter and I have to backwash, because the PSI gets to be high quickly. When I backwash with the CH, the water coming from the filter is whitish (vs dirty when I really need to backwash the filter). I also tried disolving the CH in a bucket and the thing won't disolve or very little.

    Do I have a bad/old? batch or am I missing something?

    here are my numbers this morning, opened pool yesterday, with very decent looking water:

    FC 20 (didn't mean to raise it that high, I was shooting for 14)
    CC 0
    PH 7.0
    TA 80
    CH 200
    CYA 20
    t 52F
    free form 40k gal, IG, plaster, Triton II 100C sand filter, Lite 2 heater
    1 1/2 HP Pentair Ultra Flow High Performance pump
    Caretaker in-floor cleaning system

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    Mod Squad Bama Rambler's Avatar
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    Re: Disolving CH

    I've added calcium a few times an always dissloved in in a 5 gal bucket. I've never had a problem getting it to dissolve. Sounds like you have something going on with the calcium you have.
    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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    Guest

    Re: Disolving CH

    Why do you want to raise your CH? Around here folks would love to have their level at 200!

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    botanica37's Avatar
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    Re: Disolving CH

    I am going by the poolcalculator, here the CH starts at 250...and with all my values in range, the pool calculator suggests corrosion of plaster likely. The only way I can finetune to balance that is by raising the CH.

    Thoughts?
    free form 40k gal, IG, plaster, Triton II 100C sand filter, Lite 2 heater
    1 1/2 HP Pentair Ultra Flow High Performance pump
    Caretaker in-floor cleaning system

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    JasonLion's Avatar
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    Re: Disolving CH

    The recommended CH level is between 250 and 350, so you do want to raise it. simicrintz is from an area with very high CH levels in the tap water, something that is extremely unlikely to be an issue in VA.

    Try dissolving the CH in a bucket full of hot tap water. Most of it should dissolve quite quickly, leaving just a few bits of undissolved debris. If it doesn't dissolve quickly, it might not actually be the right chemical.
    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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    Guest

    Re: Disolving CH

    Jason-The recommendation that we see here is that "optimum" CH levels should be maintained between 200-400 ppm. Of course we can't seem to hit those levels here with our CH coming from the tap higher than that Am I wrong in trying to get to the lower end (200 ppm) of the scale, if you are saying that 250-350 is better?

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    JasonLion's Avatar
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    Re: Disolving CH

    Recommended Levels, an article in Pool School, lists the ranges recommended by TFP. The CH level recommended for plaster/pebble/tile/gunite pools is 250 to 350. If you want to talk about why we recommend that, you should start a topic in The Deep End.
    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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