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Thread: Help with increasing CH level

  1. Back To Top    #1

    Join Date
    Jul 2014
    Outer Banks, NC

    Help with increasing CH level

    First I want to thank everyone for the wealth of information provided on this website.

    We installed our pool approximately 8 years ago and until I found this site this year I had never tested chlorine other than the OTO method, did not test for CYA or CH. I have now discovered CH in our pool is very low. Please advise me the best way to raise it without causing cloudiness. The water is so clear and sparkling now. I also think my FC is on the high side. My SWG is set at 40% so I don't know if I need to lower it or cut it off for a period of time, but maybe y'all will tell me it is fine too.

    Here is my most current test samples if I need to tweak anything else.

    FC 8
    CC 0.5
    PH (this one is hard because of the color) I believe it is 7.8
    TA 80
    CH 70 (fiberglass pool)
    CYA between 40 and 50 mark
    Temp 84 degrees
    salt level on SWG 3200

    I am testing with Taylor K-2006

    Thank you.
    12K gal, IG fiberglass, Hayward pump and sand filter, Aqua Rite 20 SWG, installed 2008, Taylor K-2006 w/magnet spinner

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Help with increasing CH level

    Welcome to TFP!

    Yes, turn down the SWG at least a little. If FC is too high, lower the percentage. If FC is too low, raise the percentage.

    We recommend CYA be between 70 and 80 with a SWG.

    Calcium can be raised with calcium chloride, sold in pool stores as calcium increaser and sometimes available from hardware stores as an ice melter. Raising CH should not cause any cloudiness, just don't add it all at once, break it up into two or three smaller additions.
    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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