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Thread: Pool Calculator Results Question

  1. Back To Top    #1
    Butterfly's Avatar
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    Pool Calculator Results Question

    Here are my #'s:

    FC 3
    CC 0
    TC 3
    PH 7.4
    ALK 60
    Cal 270
    CYA ...maybe 5..ish (trying to get some in there)
    Temp 60

    If I am using the PC correctly, our pool has a "potential to become corrosive to plaster". Umm, what do I do now?
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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  2. Back To Top    #2

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    Don't panic. As you add Cyanuric Acid (the pure stuff), the pH will drop so you'll have to add either 20 Mule Team Borax or Arm & Hammer Washing Soda (not the detergent) to raise it at which point the TA will go up and the water will be less corrosive. You can also raise the pH a little to 7.5 or higher and you'll be fine. Finally, as the water warms up, it will be less corrosive. Don't sweat it. If the index were -1.0, then you'd want to fix things more quickly, but since you're doing chemical adjustments now anyway, just add more CYA and keep the pH up and you'll be fine.

    Richard
    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"

  3. Back To Top    #3
    Butterfly's Avatar
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    Thank you, Richard

    You know, we really do appreciate our gurus
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  4. Back To Top    #4
    saraiks's Avatar
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    As a rule of thumb I run my pH higher by 0.1 for every 10 degrees of temprature below 75.

    i.e. for water temp of 75F pH is 7.5
    for 65F pH is 7.6
    for 55F pH is 7.7
    for 45F pH is 7.8

    This works well for me over the winter as I don't close my pool here in sunny "Kaaliphorniya"

    my 2 Cents..
    16,000 G in ground Gunnite (plastered) with attached Spa, Gemini 3 NG Heater, Sta-rite cartridge filter, Aquabot Mark V, TF test kit

  5. Back To Top    #5

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    It turns out that roughly speaking for every 15F drop in temperature, water will rise in pH by 0.1 so the saturation index doesn't move very much even from 80F to 36F (the pH rises by 0.3 and the index drops by about 0.1). So though you can manually try and adjust the pH, in a pool with very stable pH it will adjust by itself as the temperature changes. This is what happens in my pool every season, though I did notice a larger rise in pH over this winter possibly due to the higher TA I started with and more carbon dioxide outgassing (in spite of the cover being on most of the time).

    Richard
    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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