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Thread: Getting balanced after new liner, initial levels

  1. Back To Top    #1

    Join Date
    Jun 2016
    Location
    Walhalla, SC
    Posts
    275

    Getting balanced after new liner, initial levels

    Last year we bought a house with a salt water pool and had some issues. For the most part, I spent all season just trying to keep up, and used the pool store to get it done. Thankfully, my pool store is not very evil, they just get the numbers and tell you what to do, it's up to you if you buy chemicals there or not. The previous owner got a new liner under warranty due to excessive fading, but hadn't put it in. Since the pool is 6 years old we decided to just go ahead and do it, since we never did get everything well-balanced our first season. I got a ton of salt and chemicals from the store to get things started, and the results were decent.

    This year, I decided to go the full TFP route, with maybe an occasional checkin at the pool shop this first year just to make sure I'm not doing something completely wrong. I ordered the TF-100 kit just yesterday and it came in today! So pleased with the service. I finally sat down and ran some samples through it, and it was about what I expected after my initial balance from the pool store numbers. Here are my levels before and after my initial setup:

    FC: 4.1 -> 8.0
    CC: ??? -> 0.0-0.5 (there was just maybe a tinge of pink before)
    PH: 6.2 -> 8.0
    TA: 34 -> 130
    CH: 67 -> 225
    CYA: 0 -> 30 (though need more experience with the test)
    Salt: ??? -> 2500

    Looks like the main mistake the store made was in TA. I just added CYA (slowly into skimmer) on Sunday 5/7, so should I bother correcting any more until the full week is up? I've been avoiding backwashing and shouldn't need to for several days. I also just dumped 18-20oz of 20 baume muriatic acid to try to get pH back down and start working on excessive TA. Is there anything else I should be doing other than a few more bags of salt? How long after adding acid should I retest pH to see if it's getting better?

    Pool when we bought last year (realtor pic), sorry no pics of the messed up version:
    ISphatbalcfebi0000000000.jpg

    Pool after new liner:
    376380005U_IMG_0762.jpg

    Deep end picture:
    376380005U_IMG_0764.jpg
    20x40 28kgal in-ground vinyl built 2011, liner replaced 2017
    Pentair Tagelus TA60D sand filter, Pentair SuperFlow 1HP pump, Intellichlor IC40 SWG, Dolphin Active 30i
    City water, TF-100 test kit + speedstir.
    Recommended Levels | Chlorine/CYA Chart | SLAM

  2. Back To Top    #2
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    20,312

    Re: Getting balanced after new liner, initial levels

    Give the CYA a few days to completely dissolve and mix before you waste any more reagent testing it.

    pH and FC should be tested daily for a while, which is why the TF100 comes with that handy little blue box kit. If you're unsatisfied with that FC test, then use the FAS-DPD. You should anyway, so you can calibrate your eyeballs.

    The pH test block gets capped and inverted once or twice to mix, then take the reading. If you need to add acid, you'll need to also run the TA test to calculate the dose.

    CC .5 or less is treated as zero. Some municipalities use chloramines to sanitize and they will show up. The sun will burn it off.

    Your TA may not be that high. Before you start dumping acid, recheck it. Wipe the tip of the R-009 off with a damp paper towel before titrating.
    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!

  3. Back To Top    #3

    Join Date
    Jun 2016
    Location
    Walhalla, SC
    Posts
    275

    Re: Getting balanced after new liner, initial levels

    Quote Originally Posted by Richard320 View Post
    Give the CYA a few days to completely dissolve and mix before you waste any more reagent testing it.

    pH and FC should be tested daily for a while, which is why the TF100 comes with that handy little blue box kit. If you're unsatisfied with that FC test, then use the FAS-DPD. You should anyway, so you can calibrate your eyeballs.

    The pH test block gets capped and inverted once or twice to mix, then take the reading. If you need to add acid, you'll need to also run the TA test to calculate the dose.

    CC .5 or less is treated as zero. Some municipalities use chloramines to sanitize and they will show up. The sun will burn it off.

    Your TA may not be that high. Before you start dumping acid, recheck it. Wipe the tip of the R-009 off with a damp paper towel before titrating.
    Unfortunately it looks like TA really is that high on a second test awhile later. They had me dump 41 lbs of baking soda in there, and it looks like their calculation was trying to get me to 110-120 range. I really should have started TFP from the get-go, just thought it'd be easier if I had it fairly close first. Live and learn.

    I'll wait until next Monday or so to take the next CYA reading. FC readings were 8.0 via the FAS-DPD , but maxed out the blue box test at 5.0. I bumped my SWG down a notch, but I wanted to keep it a bit elevated while getting CYA up so it keeps stable.

    Thanks for the tips, I've been lurking here a good bit waiting on my liner. Have to get used to some of these tests (CYA was probably most difficult), but I think it won't take long to get up to speed! Really appreciate all the help in this forum.


    20x40 28kgal in-ground vinyl built 2011, liner replaced 2017
    Pentair Tagelus TA60D sand filter, Pentair SuperFlow 1HP pump, Intellichlor IC40 SWG, Dolphin Active 30i
    City water, TF-100 test kit + speedstir.
    Recommended Levels | Chlorine/CYA Chart | SLAM

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