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Thread: SWG Cannot keep chlorine levels up. bad cell?

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    SWG Cannot keep chlorine levels up. bad cell?

    Can't get chlorine level up..
    24,000 gallon pool, aqua-rite SWG, T-9 cell, safety cover

    Salt level 2800

    Aqua-rite diagnostics
    Pool temperature = (74)
    Cell voltage (32.5 volts)
    Cell current (0.00amp)
    Desired Output % (75P - but on superchlorinate)
    Instant salinity (-0)
    Product name (AL-3)
    Software revision level (r1.58)
    Chlorinator cell type (t-9)

    FC = barely 1 more like .75
    CYA = 25
    TA = 50
    Pool was opened and cleaned, no visible algae, dirt and organics(pine needles) on bottom. all cleaned and added 8 gallons 8.25 bleach(friday), then 2 gallons more following day. Cannot keep chlorine level up. could this be the cell?
    Thanks for any help!
    Brian

    Thanks for any help
    25,000 gallon, in-ground, vinyl liner
    Hayward S244T sand filter
    Hayward super-pump 1.5 Horse
    Hayward Aquarite SWG
    Pool construction 1999

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    Re: SWG Cannot keep chlorine levels up. bad cell?

    A T-9 cell on a 25000 gallon pool is woefully undersized.

    Heck, a T-15 would be marginal.
    16 x 32 17500 gallons
    Vinyl in-ground
    Hayward 250# Sand Filter
    1 HP Pump
    Hayward SWG

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    Re: SWG Cannot keep chlorine levels up. bad cell?

    Do you have any LED lights on? With those numbers the cell is not producing any chlorine. It could be the cell or a couple other things.

    For a quick check, most Leslie's pool stores have a system that checks the cells. If you don't have a Leslie's check other stores near you to see if they have a cell tester.

    Get some more bleach in the pool and it would be a good idea to run an OCLT to determine if you have organics consuming the chlorine. If the pool fails the OCLT, then you will have to SLAM the pool.
    16k gal plaster with raised spa, Jandy DEV60 filter, 2 HP 2-speed SHPF Jandy Stealth pump
    Hayward Aqua Rite T-15 SWCG, Jandy LXi 400k BTU NG heater, 350 sq.ft. of Sun Star solar panels, TF-100 Test Kit, Dolphin s300i Cleaner
    Test Kits . Pool Math . Chlorine/CYA Chart . The SLAM Process

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    Re: SWG Cannot keep chlorine levels up. bad cell?

    Thanks for taking the time to reply!!!
    I just took a water sample from the return area and I get FC=3.0, so it is producing chlorine. Maybe I need to run it longer?? What size cell would you recommend for a 24,000 gallon pool?
    Thanks,
    Brian
    25,000 gallon, in-ground, vinyl liner
    Hayward S244T sand filter
    Hayward super-pump 1.5 Horse
    Hayward Aquarite SWG
    Pool construction 1999

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    Re: SWG Cannot keep chlorine levels up. bad cell?

    With your pool size, the cell will have to run 24/7 at 100% to make 3.5ppm of chlorine.

    Run an OCLT tonight if you can, I have a strong feeling that you need to SLAM the pool.

    A T-15 cell would make double the amount of chlorine in a day compared to the T-9.
    16k gal plaster with raised spa, Jandy DEV60 filter, 2 HP 2-speed SHPF Jandy Stealth pump
    Hayward Aqua Rite T-15 SWCG, Jandy LXi 400k BTU NG heater, 350 sq.ft. of Sun Star solar panels, TF-100 Test Kit, Dolphin s300i Cleaner
    Test Kits . Pool Math . Chlorine/CYA Chart . The SLAM Process

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    Re: SWG Cannot keep chlorine levels up. bad cell?

    Quote Originally Posted by ping View Post
    With your pool size, the cell will have to run 24/7 at 100% to make 3.5ppm of chlorine.

    Run an OCLT tonight if you can, I have a strong feeling that you need to SLAM the pool.

    A T-15 cell would make double the amount of chlorine in a day compared to the T-9.
    I will do an OCLT tonight and report back in the morning. Strange, the Cell has worked and supplied chlorine for 3 years now, running for 8-10 hours a day....
    Thanks Brian
    Ps - now time to take out a small loan to buy a t-15, lol
    25,000 gallon, in-ground, vinyl liner
    Hayward S244T sand filter
    Hayward super-pump 1.5 Horse
    Hayward Aquarite SWG
    Pool construction 1999

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    Re: SWG Cannot keep chlorine levels up. bad cell?

    Sorry for not getting back to the group. when I went to check the system the other night, I was getting check cell and low salt indicators. I have added more salt and have it up to around 3100. My cell numers are different now too. It's definitely producing chlorine, but I beleive the cell is on its way out. Will take it to pool store and have cell tested. will also have water tested to see what they say. Think I'm going to buy a t-15 cell and throw it in(after I stabalize my numbers) and see how that goes.
    Will report back...

    On the t-15 cells, I see some non OEM units, are any of them reliable or just pay ull price for an OEM?

    Thanks,
    Brian
    25,000 gallon, in-ground, vinyl liner
    Hayward S244T sand filter
    Hayward super-pump 1.5 Horse
    Hayward Aquarite SWG
    Pool construction 1999

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    needsajet's Avatar
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    Re: SWG Cannot keep chlorine levels up. bad cell?

    Seems like three seasons is a good run for that size cell on that size pool. The T-15 should last you twice as long. Hope that makes the loan payments less painful!
    12k IG salt; glass beads in plaster; K-2006C, K-1766, CCL, and Aussie 4in1 (HTH); Pentair Eco800 1.2HP VS; Zodiac SWC 1.3 lb/day (25 g/hr); 25" filter recycled glass; OKU solar panels; 1/2 HP solar pump; Rebel (Warrior) pool cleaner; FlowViz; prior pool AG 10k | Read Before Posting to get the best possible advice | ... and this helped me a lot!: TFPC for Beginners

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    Re: SWG Cannot keep chlorine levels up. bad cell?

    Took it to local pool store and the store checked the cell and it errored right away twice.... tried to sell me a t-cell-15 for $630.00 + tax....
    Thanks,
    Brian
    25,000 gallon, in-ground, vinyl liner
    Hayward S244T sand filter
    Hayward super-pump 1.5 Horse
    Hayward Aquarite SWG
    Pool construction 1999

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    Re: SWG Cannot keep chlorine levels up. bad cell?

    update - purchased a t-15 from Hayward. Restled with buying a non OEM, but finally said I don't want to gamble. Before I took the cell to the pool store(where they said it errored), I cleaned it with straight white distilled vinegar. After the pool store, I took it home and installed it. It's been working flawlessly and my chlorine #'s are through the roof(6.5 as per this morning). It has been on super chlorinate the whole time after reinstalling. So now I have a brand new unopened t-15 and seems that the T-9 is working. I took it off super-chlorinate this morning and have it at 50%. Will test OCLT tonight and report back after tomorrow mornings test. Only thing I have really done so far is, clean cell with vinegar, and raise the cya a little bit with borax and TA a little bit with baking soda. the test from the pool store(besides telling me my cell was bad) were all in bad shape:
    FAC = 0 TAC = 0 Salt = 3000 CaHd = 100 CYA = 40
    TA = 60 pH = 7.2 Copper = 0 Iron = 0 Phosphate = 300

    Will report all numbers I can after OCLT...

    Thanks,
    Brian

    PS - if I find out that cell is working, should I return T-15 or keep it until needed(do they go bad just sitting watching the grass)?
    25,000 gallon, in-ground, vinyl liner
    Hayward S244T sand filter
    Hayward super-pump 1.5 Horse
    Hayward Aquarite SWG
    Pool construction 1999

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    Re: SWG Cannot keep chlorine levels up. bad cell?

    OCLT results

    last Night | this morning
    FC = 7ppm | 5.5ppm
    TA = 85 | 75
    CYA = 45 | 45

    Pool ran for 12 hours, sample taken 3 hours after pool shutoff.
    I'm guessing my cell is working fine now. will still try to get CYA up...
    Thanks,
    Brian
    25,000 gallon, in-ground, vinyl liner
    Hayward S244T sand filter
    Hayward super-pump 1.5 Horse
    Hayward Aquarite SWG
    Pool construction 1999

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    Re: SWG Cannot keep chlorine levels up. bad cell?

    looks like a SLAM is needed if you lost that much overnight, should be under .5 loss overnight..

    How does your water look it may go fast
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
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    Re: SWG Cannot keep chlorine levels up. bad cell?

    water is crystal clear. only thing, we have been getting bad thunderstorms last couple of days. will OCLT tonight to verify numbers again.....
    25,000 gallon, in-ground, vinyl liner
    Hayward S244T sand filter
    Hayward super-pump 1.5 Horse
    Hayward Aquarite SWG
    Pool construction 1999

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    Re: SWG Cannot keep chlorine levels up. bad cell?

    no OCLT last night...
    This morning before starting pool FC 4.0
    25,000 gallon, in-ground, vinyl liner
    Hayward S244T sand filter
    Hayward super-pump 1.5 Horse
    Hayward Aquarite SWG
    Pool construction 1999

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    needsajet's Avatar
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    Re: SWG Cannot keep chlorine levels up. bad cell?

    Quote Originally Posted by brianmac View Post
    update - purchased a t-15 from Hayward....

    PS - if I find out that cell is working, should I return T-15 or keep it until needed(do they go bad just sitting watching the grass)?
    Glad the T-9 cleaning worked and I think keeping the T-15 would be fine, but warranty start date will be later if you return and re-buy later.
    12k IG salt; glass beads in plaster; K-2006C, K-1766, CCL, and Aussie 4in1 (HTH); Pentair Eco800 1.2HP VS; Zodiac SWC 1.3 lb/day (25 g/hr); 25" filter recycled glass; OKU solar panels; 1/2 HP solar pump; Rebel (Warrior) pool cleaner; FlowViz; prior pool AG 10k | Read Before Posting to get the best possible advice | ... and this helped me a lot!: TFPC for Beginners

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    Re: SWG Cannot keep chlorine levels up. bad cell?

    T-9 still working strong. Have it down to 30% and 4-4.5 ppm chlorine this morning. Returning t-15, due to warranty concerns...
    Thanks for all the help!!!
    Brian
    25,000 gallon, in-ground, vinyl liner
    Hayward S244T sand filter
    Hayward super-pump 1.5 Horse
    Hayward Aquarite SWG
    Pool construction 1999

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    needsajet's Avatar
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    Re: SWG Cannot keep chlorine levels up. bad cell?

    Be sure to do the OCLT carefully per: Pool School - Perform the Overnight FC Loss Test (OCLT). This really needs to be done, k?

    Especially, be sure the SWG if turned off for the overnight test. It would be a very good idea to put a half-gallon of bleach in while the pump is still running during the day, so it has time to mix before the OCLT, and the OCLT gets done a high enough level.
    12k IG salt; glass beads in plaster; K-2006C, K-1766, CCL, and Aussie 4in1 (HTH); Pentair Eco800 1.2HP VS; Zodiac SWC 1.3 lb/day (25 g/hr); 25" filter recycled glass; OKU solar panels; 1/2 HP solar pump; Rebel (Warrior) pool cleaner; FlowViz; prior pool AG 10k | Read Before Posting to get the best possible advice | ... and this helped me a lot!: TFPC for Beginners

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