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Thread: First post. Low Hardness, high CYA

  1. Back To Top    #1

    Join Date
    Oct 2015
    Kailua, Hawaii

    First post. Low Hardness, high CYA

    Hello all. First post. I've been taking care of my own pool for almost 2 years now, and I wish I had been more consistent at the start. I'm here to learn consistency and fight some problems that have developed.

    Test results (taylor 2006):

    FC - 1.2-1.4 (Was 3.6 two days ago. I'm trying to keep it on the lower end because I added bioactive CYA reducer 5 days ago, and optimal results are supposed to come from 2-3 chlorine levels)
    CC - 0-0.2
    pH - 7.4
    TA - 140
    CH - 110
    CYA - 110

    1) For tiled pools is a slightly higher TA ok? I use primarily dichlor and trichlor for sanitizing, so would anyone recommend 130-140, or is 120 (or lower) still optimal? Similar question for pH?

    2) I know I need to increase hardness, but for tiled pools what is optimal? The range of 200-400 seems really broad! If I do choose to keep a slightly higher pH and TA should I keep a lower CH?

    3) Should I increase CH immediately and fight higher CYA over time? The bioactive hasn't put a dent in CYA yet, but it's only day 5-6.

    Thanking you experts in advance.
    20x35 IG pool "tiled" ~35,000 gallons; 500# Purex Triton II sand filter; Leap Pump (spectralight brand) variable speed pump; 40 year old pool (tiled 16 years ago); Taylor 2006; solar-breeze floating skimmer (currently down), Dolphin Nautilus Robotic Pool Cleaner (used 2-3 times per month), occasional manual vacuum to waste.

  2. Back To Top    #2
    Mod Squad tim5055's Avatar
    Join Date
    May 2014
    Columbia, SC

    Re: First post. Low Hardness, high CYA


    We have yet to see positive results from Bioactive so really do not recommend it. Once you get through the process you need to get the FC up before the pool goes green.

    I think you will find that you will need to replace water to get the CYA down. Additionally you need to move away from dichlor/trichlor or you will be back in the same boat quickly.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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