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Thread: Results of first water test...

  1. Back To Top    #1

    Join Date
    Apr 2015
    Atlanta, GA

    Results of first water test...

    Hello everyone!

    Long time lurker as a guest. I've learned a lot by just reading the posts here for the last month. I've had an AG Intex in the past, but didn't really know what I was doing. Lasted a couple of years, but had a few minor leaks due to rocks underneath because of my lack of prep-work, so I just bought a new Polygroup 14' round pool this year. Through the wall skimmer and 1500gph pump are nice qualities to have on a pool this small (~3500 gallons where I have it filled).

    Haven't been able to swim in it yet with the temps being unusually low for ATL, but I ordered my first testkit from and here are the results:

    FC - 11
    CC - 0
    TA - 165
    PH - 7.2
    CYA - 40
    CH - 90

    The reason for the FC being so high is because I've been using some of my old trichlor tablets while the pool has been covered. Didn't realize it had gotten so high - test strips suck! I will be switching to bleach this year, but I figured I'd use them to get some CYA in the water to start off with.

    TA is a bit high because went overboard on some baking soda a couple of weeks ago. Water is crystal clear, and high PH doesn't seem to be an issue, so I figured with such a low CH, I didn't have to worry about cloudy water much. Letting it go for now...

    PH is a bit lower than I though it would be (again, test strips are terrible). It was 7.8 when I added the baking soda according to pool store. Just turned my return jet upside down to aerate the water while I'm running the pump. I assume that will help.

    CYA may or may not be accurate - water temp was about 65F when I ran the test. I forgot to let the water warm up first.

    CH is low, but I don't think it's a problem with a vinyl liner, correct?

    Either way, I just pulled my trichlor tabs out due to the high FC and reasonable CYA numbers. I'll let it get down to 5 or 6 and maintain that level with bleach provided my CYA test is accurate. It sounds accurate to me since I added stabilizer a few weeks ago to get it to 30 and have been using pucks since then.

    Anyway, any suggestions are welcome. Thanks for reading!

  2. Back To Top    #2
    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Central Minnesota

    Re: Results of first water test...

    Welcome to TFP!

    Levels look pretty good. FC is of course higher than needed, just let that float down to recommended level for 40 CYA. TA can be actively lowered by adding acid to bring pH down to 7 - 7.2 and TA down, then aerating to bring pH back up. It's the adding acid part that lowers TA, not aeration. You can do this slowly over time or fast mode by increasing aeration, frequency of need to add acid. CH is not critical for vinyl pools. Helpful to have at least a little so anywhere from 50-350 is fine for vinyl pools. Don't add anything to increase CH. I'd say your CYA reading is good enough to assume 40 ppm. Could test in a week or so if you need reassurance, but it's probably fine.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

  3. Back To Top    #3
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: Results of first water test...

    Welcome to TFP!!!

    Looks like you are starting off on the right foot

    I think you evaluated your results very well and seems you have a good understanding.
    The CYA is probably pretty close, might be a little low due to water temp.
    You are right the low CH does not matter for your pool.

    Feel free to ask any questions if they come up, but I think you are heading for a great pool season.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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  4. Back To Top    #4

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Results of first water test...

    Welcome to the forum. You have your pool under complete control. Nice work understanding what to do and then doing it.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  5. Back To Top    #5
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Results of first water test...

    The low pH was caused by the acidic trichlor pucks. Without that slow acid feed, I expect your pH will rise pretty rapidly. Just add acid to go back to 7.2 whenever pH rises to 7.8. The TA will drop some every time you add acid. There's no reason to get aggressive about it. You're far away from danger of scaling with that low CH.
    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.
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  6. Back To Top    #6
    Mod Squad
    Join Date
    Aug 2012
    DFW, TX

    Re: Results of first water test...

    Welcome to TFP! Wow, that is your first post? Best first post I've seen since the pork belly post last week! You are already an expert after one post! Bravo!

    Want to see the pork belly? post #17 YUM!
    TFP Moderator
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  7. Back To Top    #7

    Join Date
    Apr 2015
    Atlanta, GA

    Re: Results of first water test...

    Thanks for all the feedback!

    Richard320 - I realized just after I posted that the CYA in the stabilizer/trichlor tabs has probably been lowering my PH. You're comment has confirmed that in my mind.

    JVTrain - I've read about the muriatic acid, aerate, repeat trick for lowering TA, but since the only downside to high TA (other than cloudy water/scaling which is unlikely considering my low CH) is a gradual involuntary increase in PH, I probably won't worry about using that tactic now since PH is currently down to 7.2 from 7.8 without adding any MA.

    Now that CYA is good, I'm going to quit the pucks. From what I've read, everything should stay the same except the PH may rise due to the high TA in which case I'll throw some MA in there which should lower the PH and TA simultaneously bringing me into the target ranges.

    Of course, I'll allow FC to drop to my target of around 6ppm and maintain with liquid chlorine/bleach.

    I need the weather to warm up so I can swim! LOL

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