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Thread: Low to no FC, no CYA, high pH......where to start?

  1. Back To Top    #1

    Join Date
    Apr 2014
    Mobile, Alabama

    Low to no FC, no CYA, high pH......where to start?

    So I'm trying to get my pool ready for the season. I've been adding liquid chlorine (10.5%) over the winter since "closing" to keep the water clear. The water started to get a little cloudly last week so I SLAMed it and it's sparkling clear again, but I noticed my FC dropped quick. Low and behold, my CYA is next to 0. I did the black dot test and filled that tube up without making the dot disappear. I've got chlorine, CYA, and muriatic acid, but I wanna know what I should add first? I figure I should add CYA first as this will protect any chlorine I add and help lower pH. What'cha think?

    Kevin T
    16' x 32' Vinyl Liner Grecian Pool. 20,000 Gallons. Sta-Rite SuperMax 1HP Pump (PHK2RA6E-102L). W. Cooper Ranger Series 25" Sand Filter. Dolphin Nautilus Plus.

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

    Re: Low to no FC, no CYA, high pH......where to start?

    First, lower the PH to the 7.6 to 7.8 range. The CYA will lower it a little more, but get it in range first.

    Then start working on raising CYA.

    Add a minimum of 2 ppm of chlorine once a day through the raising CYA process, even if it all vanishes.
    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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