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Thread: Question On Borax and Fresh Plaster

  1. Back To Top    #1

    Join Date
    Jun 2013
    Tucson Az

    Question On Borax and Fresh Plaster

    Hello All,

    So my Pool has become crystal clear, its wonderfull. My only problem right now is Tucson Monsoon rain and Fresh plaster, are casuing PH to rise pretty rapidly. This week I had to add 15oz of MA every day it rained to drop it from 7.8 to 7.5. I am pretty sure this is just the plaster and rain, but I was wondering if adding some Borax to condition the water will help any. I have been thinking about this addition this week, I wanted some opinions on if it will affect fresh plaster or not.

    Also, Sunlight is still creating havoc on my FC levels, Im seeing drops of 3-4ppm pr day, <.5 at night. CC still at zero. My current CYA is 40, Suggested range is 30-50 for CYA for my pool, which puts Target FC at 5ish. I was told to keep it around 5 for the plaster so I was thinking this would be a good number to hold. So I'm looking for some advice, if I bump CYA to 50, and target FC will be around 6ish, would this cause any complications for the plaster? I donít think it will, I belive the guy was just a sales man quoting numbers to me.

    Anyone else in Southern Arizona care to comment on their CYA levels for our high levels of heat and constant sunlight?


    Current Levels
    FC: 5
    PH: 7.5
    CC: 0
    CYA: 40
    TA: 120
    CH: 180
    15000 gallon in ground pool.
    White Plaster, Tucson Az
    Duel Speed Pump with Sand Filter.

  2. Back To Top    #2

    Join Date
    Aug 2010
    Dallas, TX

    Re: Question On Borax and Fresh Plaster

    Not with TA at 120, I would not add it. Get it around 70-80 then go for it. Keep lowering pH to 7.2 and it'll get there eventually.

    Has your pool builder talked to you about CH levels? I'm wondering if it's time to get that level up, or if you need to wait. I would talk to them though, as they are the ones warrantying the pool.

    I see no problem taking CYA to 50 and raising FC a bit.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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  3. Back To Top    #3

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Question On Borax and Fresh Plaster

    Just keep your pH under control for now with muriatic. Borax raises pH rather substantially and you would need even more muriatic to counteract that effect.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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