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Thread: Result?

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    Result?

    June 2 FC2 pH7.0 TA100 Salt 2930 Temp72 water clear
    pool calculator suggestion - added 6 kg salt and borax which I couldn't find so added pH+ according to directions on bottle (added mid afternoon)
    June 3 FC 5 pH7.4 TA150 Salt 2700 Temp 68 water clear
    why did the #'s change so much overnight. We did receive some rain during the day yesterday.
    pool calculator add 975ml borax and 27 kg of salt - have not yet done.
    On ground pool 16x32 with deep end -shallow end 4' deep end 7' 80 000L of water pool installed 2011 SW (currently not working) sand filter we are in ontario

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    JasonLion's Avatar
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    Silver Spring, MD
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    Re: Result?

    The salt number is going to fluctuate. Even the better salt tests are +-400, so your results are well within the range of variation you would expect to see from the test even when the actual salt level is not changing at all.

    The PH change is not surprising given that you added some PH +, and that would also account for some of the TA increase (PH + also increases TA, though not usually by this much). Also, PH is fairly variable and tends to drift up over time.

    The TA change is surprising. Some of the increase would have come from the PH +, but this is more than I would expect. I suspect some kind of minor problem with testing. The TA liquid drop test is especially prone to electrostatic interference. Try wiping the tip of the dropper bottle with a damp cloth before starting the test.

    Another thing to keep in mind is that the Pool Calculator doesn't really tell you what you should do, instead it tells you how to do something you have asked it how to do. The numbers in the target column should be adjusted depending on your specific situation, something it can't do for you. The PH is now acceptable. I wouldn't raise it any further. Your salt level is a little low (by either test result) so I would raise salt a little.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    Re: Result?

    Thanks
    The targets I have set for our pool are
    TC 2
    pH 7.5
    TA 100
    CH260
    CYA 50
    Sodium 3000
    Does that seem appropriate?
    On ground pool 16x32 with deep end -shallow end 4' deep end 7' 80 000L of water pool installed 2011 SW (currently not working) sand filter we are in ontario

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    Richard320's Avatar
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    Jan 2010
    Location
    San Dimas, CA (LA County)
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    Re: Result?

    Quote Originally Posted by BStaveley
    Thanks
    The targets I have set for our pool are
    TC 2
    pH 7.5
    TA 100
    CH260
    CYA 50
    Sodium 3000
    Does that seem appropriate?
    The chlorine is the minimum recommended. That's too low. You want some breathing room so when someone gets in the pool all sweaty, you don't immediately dip below minimum. At the end of the day, when the sun's gone and the pump is off and everyone's done swimming, you should still have at least 2.

    If you go to http://www.poolcalculator.com/ and scroll waaaaay down to the last line in the table (it's yellow) you can select troublefreepools, vinyl, and SWG and it will place reasonable goals on the chart for you.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  5. Back To Top    #5

    Re: Result?

    water clear
    temp 70
    Salt 3500
    FC 5.5 - had been higher earlier but turned off salt generator x 24 h then restarted at lower rate
    cc - o
    Ph 7.6
    TA 140

    I took a water sample to the pool store just for comparison, their results showed,
    TC 6.3
    FC 6.3
    pH 7.9
    CYA 30
    TA 135
    Ca 118
    Borate 45
    phosphate 300
    They are suggesting adding salt (I'm okay with that); shocking the pool and putting something in to lower the PH
    Appreciate any thoughts or suggestions.
    Thanks
    On ground pool 16x32 with deep end -shallow end 4' deep end 7' 80 000L of water pool installed 2011 SW (currently not working) sand filter we are in ontario

  6. Back To Top    #6
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Result?

    Quote Originally Posted by BStaveley
    water clear
    temp 70
    Salt 3500
    FC 5.5 - had been higher earlier but turned off salt generator x 24 h then restarted at lower rate
    cc - o
    Ph 7.6
    TA 140

    I took a water sample to the pool store just for comparison, their results showed,
    TC 6.3
    FC 6.3
    pH 7.9
    CYA 30
    TA 135
    Ca 118
    Borate 45
    phosphate 300
    They are suggesting adding salt (I'm okay with that); shocking the pool and putting something in to lower the PH
    Appreciate any thoughts or suggestions.
    Thanks
    Trust your own numbers. Which means pH is fine. And they always recommend pouring in a bag of magic powder every week at least. Ignore that, too. You obviously have no problem with the SWG working, so salt is probably okay. Do you see a pattern?

    What did you get for CYA? Is it at your target of 50, or did you raise it to 70ish because of the SWG?
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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