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Thread: Trying to Maintain after SLAM

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    Trying to Maintain after SLAM

    I successfully SLAM'd the pool last week.

    On night 1 of the SLAM, FC went from 14 to 3.5. On night 2, it went from 34 to 33.5, which was a success.

    I left the SWG off for ~3 days in order to allow the FC to drop. Once it was ~8-14 (I can't remember exactly), I turned the SWG back on at 60%. Pump runs from 10am-4pm.

    Checked water tonight and FC is down to 1.5-2. SWG is brand new - Hayward T Cell 15 for up to 45k gal pools (mine is 20k gallons).

    Did a full water test tonight:
    ph 7.2
    fc 1.5-2
    cc 0-.5
    cya 55 (i'm not too confident in this #)
    ch 225
    ta 90
    salt 3200

    So I think my FC shouldn't be so low, right? Especially after it was 30+ a few days ago. I'm thinking either my T Cell isn't working - hard to believe as it's brand new and I'm not getting any errors. Or maybe my CYA is too low and I need to add stabilizer? We had torrential downpours in the past few days - not sure if that's relevant.

    Is there a way to test if the T Cell is producing chlorine? I'm thinking I'll test FC after sundown, leave the pump on all night with the T Cell at 100% and then check again in the morning?

    In the meantime, I'll take some water to the pool store to see if they measure a similarly low CYA and I'll pick up some stabilizer. And something to bring calcium hardness up.

    Would very much appreciate any guidance. I just got the test kit recently and this if my first shot at trying to maintain the water properly on my own.

    Thank you in advance.
    20,400gal Saltwater, Hayward Aqua-Rite SWG up to 45k gal, IG, Plaster, Cartridge, 2hp 1-Speed Pentair, 152k BTU Aqua Comfort Heat Pump, Well Water.

  2. Back To Top    #2
    Richard320's Avatar
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    Re: Trying to Maintain after SLAM

    First, is the T-cell all lit up like normal, with no warning lights on?
    Second, do you see bubbling in the chamber?
    Third, rinse a clear pitcher or something and submerge it upside down in front of the return jet while the generator is bubbling. Then turn it to face the return flow and let it fill from the stream. Let it flush good. Then haul it up and test the FC level there. If it's higher than the pool as a whole, the generator is working.
    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

    Re: Trying to Maintain after SLAM

    Hi Richard,

    Thanks for the suggestions.

    The T Cell doesn't have any lights on it, but the Hayward Panel has no errors and it says "Generating Sanitizer"

    Unless I'm confused, the Hayward T Cell doesn't have a chamber that's visible (to check for bubbling). Maybe I'm missing something?

    Good idea on testing the water from the return. I will try that.

    If my CYA really is 55, could that explain the low FC?

    Thanks again.
    20,400gal Saltwater, Hayward Aqua-Rite SWG up to 45k gal, IG, Plaster, Cartridge, 2hp 1-Speed Pentair, 152k BTU Aqua Comfort Heat Pump, Well Water.

  4. Back To Top    #4
    Mod Squad pooldv's Avatar
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    Re: Trying to Maintain after SLAM

    No, that CYA isn't low enough to cause that issue. It is either a SWG issue or an organic issue consuming FC.
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

  5. Back To Top    #5

    Re: Trying to Maintain after SLAM

    Tested again tonight after work. Pump was off, so I couldn't test the water coming out of the returns, but will try that this weekend if things still aren't right.

    FC up slightly to 2.5
    CC 0
    CYA 55-60

    I increased the pump schedule by 2 hours. Will see if that makes a difference.

    Also, my pool has 2 skimmers and 2 main drains (that are plumbed together). I recently got a "The Pool Cleaner" that goes into 1 of the skimmers. In order to get the suction up, I turned off the main drains. That means water is only coming to the pump through the pool cleaner and 1 of the skimmers. Is it possible that the volume of water going through the pump is greatly reduced and therefore not enough water is going through the SWG in order to get enough chlorine in the pool?

    The rain from the past few days brought the water higher than it's ever been since I've had the pool (3 seasons). Also wondering if that could have eaten up FC?

    I'm looking for a steady FC level of 4.0, right?

    Thanks again.
    20,400gal Saltwater, Hayward Aqua-Rite SWG up to 45k gal, IG, Plaster, Cartridge, 2hp 1-Speed Pentair, 152k BTU Aqua Comfort Heat Pump, Well Water.

  6. Back To Top    #6
    Mod Squad pooldv's Avatar
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    Re: Trying to Maintain after SLAM

    No, it isn't a water flow issue, if you have a water flow problem the pump will make cavitation noises and you will know it. Yes, looking for FC of 4 maybe even 5 right now to be on the safe side. Under 3 is bad and can allow algae to grow. If the SWG can't keep 4 or 5 then add some bleach.
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

  7. Back To Top    #7

    Re: Trying to Maintain after SLAM

    Checked tonight after work.

    FC up to 5
    CC 0
    PH 7.4

    So I think we're in good shape. I adjusted the pump run time down by 1 hour to 7 hours/day.
    20,400gal Saltwater, Hayward Aqua-Rite SWG up to 45k gal, IG, Plaster, Cartridge, 2hp 1-Speed Pentair, 152k BTU Aqua Comfort Heat Pump, Well Water.

  8. Back To Top    #8
    Mod Squad pooldv's Avatar
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    Re: Trying to Maintain after SLAM

    Looks good!
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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