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Thread: High calcium hardness. Adjustment to other values??

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    TXRN's Avatar
    Join Date
    Jul 2014
    Austin, TX

    High calcium hardness. Adjustment to other values??

    Good afternoon,

    Just a little back story: I'm a new pool owner and still trying to get the hang of things...usually after I do something wrong. When we first bought our house & this lovely pool, the CYA was over 200 according to the pool company that provided the pre-purchase inspection. So right before we went on vacation, we drained the pool approx 40-50% and replaced. At that point, CYA = 90, but CH that was previously normal is now 625. After coming home from vacation last week, my pool was a lovely shade of green but I couldn't figure out why I was getting algae if my FC was in the "acceptable, if not high" range (FC=5) on both my testing and at the local pool store. Low and behold, I discovered TFP website and learned with a CYA of 90, FC of 5 wasn't nearly high enough. So after a 3 days of SLAMing my pool based on the guidelines here and over a week before it cleared up (I think r/t filtering issues because FC was remaining stable at that point) things are under control. Pool is clean and clear : )

    So as of this morning my values are: FC 5 (ran out of reagent & order just came in...I know, bad, bad), CC 0.5, pH 7.6, TA 90, CH 625, CYA 90. According to the pool calculator, I added 132 oz of bleach to bring my FC up to recommended level. Do I need to adjust any other values to compensate for the high calcium hardness? Not sure if it matters, but we are in Austin, TX and our pool gets mostly full sun from about noon. We do have lots of trees surrounding pool that are constantly dropping leaves, acorns, pollen, & other fun debris.

    Thank you in advance for any guidance and expertise!
    17.5k gal, 14x30 +attached spa, IG plaster, 1hp Hayward pump, 75sqft cartridge filter, Polaris pool cleaner, Taylor K-2006 test kit

  2. Back To Top    #2

    Join Date
    Mar 2011
    Houston, Texas

    Re: High calcium hardness. Adjustment to other values??

    Here in Houston we have high CH fill water so I'm battling high CH as well. I keep a close eye on TA and pH to make sure my CSI stays slightly negative to avoid the problems caused by high CH.
    9,200 gal. Gunite Luna Quartz French Grey pool with spill over spa, two fountains on tanning ledge (rarely used)
    Pentair Whisperflo 2HP, Pentair CCP Cartridge 420 Sq. Ft., Polaris 280 with booster pump
    Pentair EasyTouch 4, RayPak LoNox 266k Natural Gas heater, Aqua Rite SWCG T Cell 9, Borates, TF-100 test kit

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