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Thread: Pool Calculator question

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    Pool Calculator question

    My TA has recently dropped to the suggested level in the pool calculator based on the TRF method and the use of a SWG. Now that all my numbers are within range the calculator is reading the potential for plaster corrosion. What am I not getting?

    Test results as of today-

    FC- 4.0
    CC- 0
    PH- 7.5
    TA- 75
    CH- 275
    CYA- 80
    Salt- 3400
    18,900 Stonescapes Tahoe Blue xtra black, 8 jet Spa, Pentair inteliflo VS , Pentair FNS 60 DE, Inteliclor40, Pentair 400,000 Mastertemp heater, 3 spillovers powered by a Pentair 1 HP whisperflo pump, The pool Cleaner, 2 Intellibright color changing lights and 400 sq ft. of Heliocol roof mounted solar.

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    Join Date
    Mar 2007
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    Re: Pool Calculator question

    When one lowers the TA to reduce the rate of pH rise in an SWG pool, one either needs to keep the pH higher at 7.7 to 7.8 or needs to have the Calcium Hardness (CH) higher or some combination of both to keep the pool closer in balance. The salt in an SWG pool makes it more corrosive lowering the saturation index by about 0.2 so that needs to be compensated (along with the higher CYA and lower TA). You can raise the CH to 400 ppm and should be fine, especially if the pH is around 7.6 to 7.7.

    By the way, what is the "TRF method"?
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Mod Squad Bama Rambler's Avatar
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    Re: Pool Calculator question

    You're only at -0.4 CSI so that's not in the serious range. Following Richards advice will get you better numbers but I wouldn't worry about a -0.4. I wouldn't worry about doing anything until it gets closer to a -0.6.

    How are you testing?
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Pool Calculator question

    Taylor 2006 test kit is the one I'm using. My TA has slowly dropped as I have added acid to balance the PH. So at this point a higher level of CH and a higher PH is what I need.

    Somebody posted that as the PH gets into the higher range that is what causes the red eye effect. Is that correct?
    18,900 Stonescapes Tahoe Blue xtra black, 8 jet Spa, Pentair inteliflo VS , Pentair FNS 60 DE, Inteliclor40, Pentair 400,000 Mastertemp heater, 3 spillovers powered by a Pentair 1 HP whisperflo pump, The pool Cleaner, 2 Intellibright color changing lights and 400 sq ft. of Heliocol roof mounted solar.

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    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: Pool Calculator question

    As described in this post a pH in the 7's should not irritate the eye which typically has a pH of 7.5.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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