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Thread: Saturation Index vs. high Ph vs. low calcium

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    Join Date
    Sep 2016
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    Halifax MA
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    Saturation Index vs. high Ph vs. low calcium

    Hello, I'm a new pool owner and boy I wish my dad had a pool because I know he would have all these answers. So far, TFP has been an amazing resource because I really want to understand and maintain my pool chemistry myself. I have only had the pool for about a month and the testing strips were all over the place so I purchased a Taylor Testing Kit 2006. My first results showed high Ph and very very low calcium index. When I messed around with the saturation index calculator though it looks like correcting those might worsen my Saturation Index. I know that isn't a huge deal b/c I have vinyl but I am worried about my concrete deck. My results today were as follows:

    Ph 8.0 (acid demand test was 1 drop to bring it to 7.6)
    Chlorine 4.2ppm
    Combined Chlorine .4ppm
    Total Alkalinity 120ppm
    calcium hardness 40ppm
    Cyanuric Acid 48ppm
    Saturation Index -0.14

    My thought based on the Taylor test kit calculations was to add in 1.15pt muriatic acid and 14.4lbs calcium chloride but when I guesstimate what that will do to my numbers it worsens my saturation index. Any help or guidance would be much appreciated!!
    Inground Vinyl Lagoon Pool 24k gallons, intalled 8/2016
    Hayward SWG Cartridge Filter and Variable Speed Pump
    Stamped Concrete Deck
    Taylor Technologies K-2006 Test Kit

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    bdavis466's Avatar
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    Aug 2014
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    Re: Saturation Index vs. high Ph vs. low calcium

    You can dismiss low CSI numbers with a vinyl pool.

    Does your water foam up? I ask because your CH is very low.

    Regardless of CSI, the pH should not be allowed over 8 and really shouldn't be below 7 (especially if you have a heater).
    -Brian-
    33K Pool/Spa, Pentair Equipment
    POOL BUILD
    Davis Custom Construction - Home Page

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    Halifax MA
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    Re: Saturation Index vs. high Ph vs. low calcium

    That is interesting you ask about foaming. I have developed bubbles coming out of my return jets and assumed I had an air leak but wanted to get my water chemistry right before I asked PB to check it out. I wonder if adding calcium will take care of that. I am going to rerun tests tomorrow and then add acid and add calcium the following day

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    bdavis466's Avatar
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    Aug 2014
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    Riverside, CA
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    Re: Saturation Index vs. high Ph vs. low calcium

    Low calcium levels below about 150 are prone to cause the water to foam. There really isn't much need for you to raise your calcium much above that level.
    -Brian-
    33K Pool/Spa, Pentair Equipment
    POOL BUILD
    Davis Custom Construction - Home Page

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