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Thread: PH is high after SLAMing

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    PH is high after SLAMing

    I want to close my pool so I decided to SLAM it instead of covering the "green pool". It took me about a 5 days to rid the pool of algae, but the pool is cloudy and my PH reading is weird. when I test it the PH reads 7.5, but if I let it sit for a couple of minutes, it goes up to about 8. Could it be that the water temperature is cold and then warms up to room temperature? Also the TA test doesn't change to red, it changes to yellowish color. I'm kind of confused here. should I wait until my FC levels start dropping before I try to check & balance both the PH & TA or is it safe to close the pool as is.
    5000 gallons above ground pool with 1/2 hp sand filter

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    pwrstrk's Avatar
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    Re: PH is high after SLAMing

    What is your FC level now ? Your PH test will read a false high with FC levels of 10 or higher. 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: PH is high after SLAMing

    cya is 70 so I got my FC to 30 and dropped to 25 this morning.

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    Re: PH is high after SLAMing

    What Pwrstrk suggests is likely the cause of your Ph reading.

    If it's still cloudy you haven't completed the SLAM yet. Can you post a picture of the waters condition ??
    I'd wait to close until you have completed the SLAM first, adjusted the Ph second (with FC under 10) and then raise the FC back up to SLAM and close.
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. ? too cold
    1979, 275gal Conway Emerald Spa P-100-2, ES-2 Spa Pack, bromine floater, indoor
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    Re: PH is high after SLAMing

    having trouble uploading a picture.

    - - - Updated - - -

    i'll keep an eye on it and report back as the FC drops
    5000 gallons above ground pool with 1/2 hp sand filter

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    pwrstrk's Avatar
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    PH is high after SLAMing

    Make sure you finish the SLAM. Your done when
    Water is crystal clear
    CC of 0.5 or less
    Pass the OCLT Test😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: PH is high after SLAMing

    You've put this much effort into it that it makes sense to finish the SLAM by passing the OCLT, then do Ph and then raise to SLAM again and close. Please add a location to your profile. If you are in an area where you have to worry NOW about a heavy freeze or snow than closing now wouldn't be that bad as you've done a good job cleaning it up. If you open in spring before your water gets above 60 you'll likely be good. I just like and think it's easier to put it to bed for the winter clean and they you are more likely not to have a problem in spring.
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. ? too cold
    1979, 275gal Conway Emerald Spa P-100-2, ES-2 Spa Pack, bromine floater, indoor
    TF-100, Best test kit - TFTestkits.net
    Please help keep the lights on, become a TFP Supporter!

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    Re: PH is high after SLAMing

    added a little bit more bleach earlier in the day. current reading for FC is 33.5 & CC is 0. i'll recheck first thing in the morning.
    5000 gallons above ground pool with 1/2 hp sand filter

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    Re: PH is high after SLAMing

    FC at 22 & CC at 0
    5000 gallons above ground pool with 1/2 hp sand filter

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    Mod Squad jblizzle's Avatar
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    Re: PH is high after SLAMing

    Looks like a fail of the OCLT to me (assuming the sun was not out for the evening or morning test). Is the water still cloudy?

    I too suggest continuing the SLAM until you pass the 3 tests before closing.
    Jason, TFP Moderator
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    Re: PH is high after SLAMing

    That's one huge chlorine loss over nite!!

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    Re: PH is high after SLAMing

    I checked first thing in the morning around 6:30 am. As of now it's still cloudy, but I can see a little bit of the bottom. Fc tests are still showing chlorine loss of more than 1. I'll keep at it
    5000 gallons above ground pool with 1/2 hp sand filter

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    Re: PH is high after SLAMing

    Keep at it, and you'll get there.

    Yellow in the TA test is from excess FC interference with it. Same with the pH. Finish the slam and fix the pH last. TA should be way down on the priority list.
    TFP Moderator
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    Re: PH is high after SLAMing

    Pool finally cleared up. Backwashed in the morning and continued to let the filter run 24/7. Came home from work today and WOW, it's crystal clear. I was worried because I never dealt with a "swamp". I've had occasional light greenish over the summer but not as bad. I'm thinking that I probably never killed the "light" algae in the first place and it grew back with a vengeance.

    thanks to all of you and have a happy fall and winter.
    5000 gallons above ground pool with 1/2 hp sand filter

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    pwrstrk's Avatar
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    Re: PH is high after SLAMing

    Good. What are your CC's ? They need to be 0.5 or less and you have to pass the OCLT Test to stop SLAMing the pool. 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: PH is high after SLAMing

    Ending a SLAM too early is a common mistake. People see the water getting clear and they think they have it licked. That OCLT is really important in telling you it's all dead.
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. ? too cold
    1979, 275gal Conway Emerald Spa P-100-2, ES-2 Spa Pack, bromine floater, indoor
    TF-100, Best test kit - TFTestkits.net
    Please help keep the lights on, become a TFP Supporter!

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    Re: PH is high after SLAMing

    CC was 0. The FC didn't drop. Stayed at 30. I did one last vacuum and backwash & rinse. So far so good. I might close it. Next week
    5000 gallons above ground pool with 1/2 hp sand filter

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    Re: PH is high after SLAMing

    Sounds like you are good
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. ? too cold
    1979, 275gal Conway Emerald Spa P-100-2, ES-2 Spa Pack, bromine floater, indoor
    TF-100, Best test kit - TFTestkits.net
    Please help keep the lights on, become a TFP Supporter!

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    Re: PH is high after SLAMing

    Hello all. since I started this thread in November, I want to update this thread instead of opening a new one for future references. So I opened my pool last weekend and did all my tests (pool was semi clear). Interestingly, my FC level was 1.5, CC-.5, pH-7.2, TA-50, CH-200, CYA-30. Shocked the pool with bleach, backwashed and vacuumed periodically, as well as scrubbed the walls and bottom. Crystal Clear . My main concern is the CYA as I think it's kind of subjective when testing. I read it at 40, my wife reads it at 30, my kids read it around 35, etc. So I went from 70 to lets say 30. I thought it would drop to 0. and also is it normal to have an FC level of 1.5 when opening the pool. that's kind of strange. I must have SLAMED the heck out of the pool. I hope I didn't ruin the liner. what do you think?
    5000 gallons above ground pool with 1/2 hp sand filter

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    Mod Squad jblizzle's Avatar
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    Re: PH is high after SLAMing

    If you close and open correctly, you should have FC left. Ideally the CYA should not really drop either except for dilution due to draining and rain/snow.
    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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