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Thread: Balance Issues after refill

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    Balance Issues after refill

    Hi! Jumping in here. Not sure where to post. You may have covered this but My head is spinning. I do not remember having such an issue about CYA any time before. My pool was refilled about 1/2 way this spring due to a now repaired tear in liner. Pool was horribly green to start. Used those socks in basket and caught amazing amounts of green algae. Pool looks blue but cloudy. Can't see bottom even in shallow part. Still can see dot at 90 on cya test. I have emptied out water twice to bottom of skimmer. So should be mostly fresh water! Still can see at 90. pH 8.0 easily. Did acid demand test. 8 drops to lower into range. Said see treatment tables (Taylor kit) and they aren't all that helpful. Initially I thought my shock level was 16. Now 35. Impossible amounts of bleach!!! The pool is over 1/2 fresh water. No shock or tablets used. I did use 1 bottle algaecide I had left over from pool company last year when I took cover off to swamp. What am I doing wrong? Was it the algaecide? Does it have that much cya? Can't tell from bottle. Sorry so wordy. Trying to tell you every thing you might need. Appreciate getting set straight. I did so well last year. Already need to reorder cyanuric reagent (by the gallon!).
    Last edited by Seal; 06-13-2016 at 01:18 PM. Reason: Spelling
    23K gal, AG, sand-Doughboy Media Master (0-1701-016), pump Pentair Optiflo N1, 1 HP, pool circa 1975 (new walls 1990, new liner 2010), Taylor Tec K2006, city water.

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    Mod Squad JVTrain's Avatar
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    Re: Balance Issues after refill

    Some clarification would be good here.

    Did you retest your water for CYA after your last refill?

    Could you post a full set of test results?
    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

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    Re: Balance Issues after refill

    Thanks for getting me to correct spot to post.
    Here are current numbers (some historical)
    FC = 11 (added 576 ozs of 8.5% chlorine bleach 2 hours ago). Best level I have gotten.
    CC = 0.5
    CYA = 90 or higher before I added chlorine 2 hours ago. That was after 2nd time I drained down to skimmer and refilled last night. Nothing had been added to pool since that refill. Total of 1 half refill of pool and two drops down to just where skimmer still gets water.
    CYA = 90 or higher. (Overcast about 75 degrees out). Can easily see black dot. Can easily see dot on plain tap water too. CYA in tap water??? That is where it gets confusing. Less I see dot = lower CYA levels correct?
    pH = 8.0 (way pinker than 8.0)
    acid balance = 8 drops to get to ~ 7.4
    TA = 80
    CH = 110

    - - - Upda
    Last edited by Seal; 06-13-2016 at 02:14 PM. Reason: double posted?!?
    23K gal, AG, sand-Doughboy Media Master (0-1701-016), pump Pentair Optiflo N1, 1 HP, pool circa 1975 (new walls 1990, new liner 2010), Taylor Tec K2006, city water.

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    Mod Squad JVTrain's Avatar
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    Re: Balance Issues after refill

    I'm not sure you're performing the CYA test correctly. The endpoint of the test is when the black dot disappears. See directions here: Pool School - CYA There is no CYA in tap water.
    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

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    Re: Balance Issues after refill

    Exactly. I tested tap water to try and see if I was doing something wrong. I could see dot clearly. Which if it had CYA I would have expected a change in ability to see it.
    On my pool water it gets a little fuzzy but still easily seen at the 90 point.
    Overcast today. Tried indirect sunlight yesterday, holding waist level and not holding tube cya test being done in. Repeated with same solution over and over. Best I can say is dot appears a little smaller and maybe fuzzier bit can see black dot.
    Hoping I am misreading something.
    I was not sure if I should be working on pH, TA and/or CH. If those were in line would CYA test be working properly?
    Not sure where to start. Pool math warns if you change this one thing your pH will go up or down or TA will change etc I am not sure what's right at this time.

    Reread CYA testing. If I can see black dot... CYA is zero? I need more CYA not less???
    23K gal, AG, sand-Doughboy Media Master (0-1701-016), pump Pentair Optiflo N1, 1 HP, pool circa 1975 (new walls 1990, new liner 2010), Taylor Tec K2006, city water.

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    Re: Balance Issues after refill

    I have been reading article after article trying to make sense of CYA levels. I did not read chamber correctly! Need glasses checked. Thought top number was 80 and totally full tube 90. Top number is 30! I have wasted 2 days and a lot of chlorine.

    So my question now is do I try to balance pH etc before slamming pool? Need to put new numbers in pool math calculator.
    Sorry, don't mean to waste your time too!
    23K gal, AG, sand-Doughboy Media Master (0-1701-016), pump Pentair Optiflo N1, 1 HP, pool circa 1975 (new walls 1990, new liner 2010), Taylor Tec K2006, city water.

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    Mod Squad tim5055's Avatar
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    Re: Balance Issues after refill

    Quote Originally Posted by Seal View Post
    I have been reading article after article trying to make sense of CYA levels. I did not read chamber correctly! Need glasses checked. Thought top number was 80 and totally full tube 90. Top number is 30! I have wasted 2 days and a lot of chlorine.

    So my question now is do I try to balance pH etc before slamming pool? Need to put new numbers in pool math calculator.
    Sorry, don't mean to waste your time too!
    Just to verify, the dot disappeared at the 30 mark and not with the tube full. If at 30 you are good to SLAM the pool (if that is what you are trying to accomplish) if your pH has been adjusted to 7.2.

    If the tube was entirely clear then you have no CYA.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Mod Squad JVTrain's Avatar
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    Re: Balance Issues after refill

    The CYA level determines what FC level you need to maintain to carry out the SLAM and then what levels you need to maintain during normal maintenance. Your chlorine was too high so you had some unnecessary loses to sunlight while it was that high, but it was still working on your algae problem. The CYA test is accurate in normal pH ranges (7 to 8.2) and as far as I know, should not be affected by TA or CH unless they are well outside normal ranges.

    Time is never wasted on questions here... well on questions that are obviously based on some knowledge of TFP methods and wanting to get your pool better. That's the goal.
    Last edited by JVTrain; 06-13-2016 at 04:14 PM. Reason: OMG WRONG YOUR...
    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

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    Re: Balance Issues after refill

    Dot always visible. At 30 or full to the top. Appears I have no CYA. So I need To get pH to a more normal level then will be able to get CYA levels straight. Thanks for the help.
    23K gal, AG, sand-Doughboy Media Master (0-1701-016), pump Pentair Optiflo N1, 1 HP, pool circa 1975 (new walls 1990, new liner 2010), Taylor Tec K2006, city water.

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    Mod Squad kimkats's Avatar
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    Re: Balance Issues after refill

    We got ya! Been there, done that by many!

    When you go to add CYA shoot for only 20 at first in case there is some CYA in the water. Easier to add than to take out.

    Now for the CYA testing..........try this-

    -fill to first line (100), GLANCE in, if you can still see the dot, fill to the next line. Again GLANCE in, keep going to each line until you come to a line where you cannot see the dot when you GLANCE in. If you stare you will see it LOL

    To add your CYA put it in a sock (any kind of sock, the cuter the better hehe) and start squeezing it. Once it is all dissolved let your pump run for about 2 hours and brush the pool real good during this time at least once over.

    After the 2 hour or so pump run....test the CYA like I talked about above. Let us know what you find.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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