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Thread: Opening Day-Need a sanity check

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    Opening Day-Need a sanity check

    Had my pool guy come take off the cover and start up the pump and filter. I only have him open and close for me and I take care of balancing the pool using TFP methods. I made the mistake of waiting too long to open and have a lovely green pool (mad at myself for not opening in mid-April).

    Baseline before chemical addition using TF 100

    PH 8.2
    FC 0
    CC didn't test
    TA 50
    CH 150
    CYA 30

    I intended to not have the pool guy put any chemicals in, but had a visitor in the house and didn't get to him before he dumped "15 Gallons" of chlorine into the pool. It was actually granular chlorine with stabilizer once I asked him, but I didn't ask if it was dichlor or trichlor. Whatever it was it raised the FC to 27.

    I stuck both dichlor and trichlor into Pool math and monkeyed with the quantity until I had the correct quantity of both that would raise my FC to 27 and also took note of the CYA increase that would result from either addition. Based on Pool Math I think he either added 100 oz of trichlor and added 17 ppm of CYA or he added 160 oz of dichlor and added 24 ppm CYA. Either way it seems I got lucky because either addition will put my CYA in the 50-60 ppm range. It also seems like either addition will lower PH by around .6

    My plan is to just continue with the slam and then raise my CH up to 250-300. I don't think there's much I can do about the PH at this point unless it is advised I let the FC drift down, adjust the PH and then start the slam.

    Anything I'm missing or any additional advice?


    25K IG, Gunite, Pebble Sheen, Sand Filter, St. Louis, MO

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    Re: Opening Day-Need a sanity check

    Better minds then mine should answer, but it seems to me that its fine to go ahead and continue the slam. Did he add anything else in an attempt to lower the PH?
    - Matrioux

    2007 18K pebble IG pool - Wincor Pool Systems automation & SWG (under development) - DE Jandy DEL60 Filter - Jandy 1HP Pump - TF-100 Test Kit

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    Mod Squad jblizzle's Avatar
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    Re: Opening Day-Need a sanity check

    The pool guy told you 15 gallons and then you learned it was granular

    Sounds like you have a pretty good handle on it, but I am not sure I would trust the guesses you were doing with PoolMath as some of the FC was likely used up quickly.

    I would give it a day and then test the CYA level to see where you are at. Then continue the SLAM process.

    It is usually best to adjust the pH before raising the FC up so you avoid scaling type issues, but your CH is low, so that might not be a concern for a few days. If the FC happens to drop around 10ppm, may as well check the pH though.
    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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    Texas Splash's Avatar
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    Re: Opening Day-Need a sanity check

    Gee, what is it with people (like your pool guy) just dumping stuff in a pool randomly? There's been a rash of that going around lately. Wow. In any case, I'm with Jason ... wait. One problem I see with your initial 8.2 pH reading is that it may have been much higher. PH is so important, I would not want you to try and guess what levels may be now... even though I commend you for trying like you did. Love that Poolmath Calculator. I also wonder, based on his testimony, if the product he dumped might have been a Cal-Hypo based product? Then you wouldn't want to add more CH for sure.

    I'm afraid if it were me, I would simply wait for the FC to settle and re-test everything form scratch. Sorry.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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    Re: Opening Day-Need a sanity check

    Quote Originally Posted by Texas Splash View Post
    Gee, what is it with people (like your pool guy) just dumping stuff in a pool randomly? There's been a rash of that going around lately. Wow. In any case, I'm with Jason ... wait. One problem I see with your initial 8.2 pH reading is that it may have been much higher. PH is so important, I would not want you to try and guess what levels may be now... even though I commend you for trying like you did. Love that Poolmath Calculator. I also wonder, based on his testimony, if the product he dumped might have been a Cal-Hypo based product? Then you wouldn't want to add more CH for sure.

    I'm afraid if it were me, I would simply wait for the FC to settle and re-test everything form scratch. Sorry.
    I specifically asked him if it was Cal-Hypo. He kind of looked at me funny and I decided to ask if it contained stablizer. He said it was stabilized so that is why I figured it must be dichlor or trichlor. My understanding is that Cal-Hypo is unstabilized, but I might be wrong.
    25K IG, Gunite, Pebble Sheen, Sand Filter, St. Louis, MO

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    Mod Squad jblizzle's Avatar
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    Re: Opening Day-Need a sanity check

    Wow, that just makes you have to wonder how much the guy understands about pool maintenance if he does not even know the different chemicals.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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    Richard320's Avatar
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    Re: Opening Day-Need a sanity check

    Quote Originally Posted by mtfanning@me.com View Post
    I specifically asked him if it was Cal-Hypo. He kind of looked at me funny and I decided to ask if it contained stablizer. He said it was stabilized so that is why I figured it must be dichlor or trichlor. My understanding is that Cal-Hypo is unstabilized, but I might be wrong.
    Don't make any logical assumptions where pool professionals are concerned. That's why you have a test kit. My money is that the CH will be spiked and CYA will be where it was.
    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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    Re: Opening Day-Need a sanity check

    Quote Originally Posted by Richard320 View Post
    Don't make any logical assumptions where pool professionals are concerned. That's why you have a test kit. My money is that the CH will be spiked and CYA will be where it was.
    I woke up this morning to go test and I found the stupid in line chlorinator must have cracked over the winter and was spraying water out all over my equipment pad. I didn't bother to check last night to see if the valve was closed and it must of filled up with water and built up enough pressure to turn the crack into a geyser. I was lucky I only lost about 3 inches of water and it didn't get below the skimmer and starve the pump. I ended up shutting down the pump for the day and went to work. This effectively put the SLAM on hold for a day since I didn't have time to add chlorine and brush the pool to mix it this morning.

    This evening I installed a new chlorinator (I don't plan to use it except for vacation) and got the pump going. The chlorine had drifted down to 5 ppm with no additions during the day, but the water did turn from green to cloudy blue, so I still made some progress. Since the chlorine was below 10 I tested the PH and added acid. After brushing and skimming pollen I retested and the PH was down to 7.5.

    BTW, I retested my CH to see if I could determine if the mystery "15 gallons" of granular my pool guys added was dichlor, trichlor or cal-hypo. Unfortunately, I have to now add in the possibility that my original test result of 150 ppm was wrong. Tonight's CH test showed I had 250 ppm, which means (according to Pool Math) he would have had to add enough 73% cal-hypo to to bring my CH up 100 ppm and this would have resulted in 150 ppm FC. Tonight's numbers also make more sense considering I checked my test results from closing day last fall and my CH was 300. That seems more reasonable considering the partial drain I do each fall prior to closing up for the winter. Regardless, the chemistry seems under control and now it's time to finish the SLAM.

    Thanks everyone for the sanity check and advise. I've learned so much on this forum the past two years. This stuff isn't that hard.
    25K IG, Gunite, Pebble Sheen, Sand Filter, St. Louis, MO

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    Mod Squad jblizzle's Avatar
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    Re: Opening Day-Need a sanity check

    Sounds like you are making good progress despite the setbacks
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Texas Splash's Avatar
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    Re: Opening Day-Need a sanity check

    Absolutely. Good work on your part. YOU are in control.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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