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Thread: SWG Cell not working?

  1. #1
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    SWG Cell not working?

    I've had a Jandy SWG for 2.5 years - love the thing. Over the past two month, though, I've had major trouble keeping the FC level up. I know the first thing you think of is CYA level. I've had it checked numerous time, myself with both the test strips and the TF-100 kit, and at the local Leslie's pool, and the level seems ok (around 70). Everything else chemically is perfect, but still can't get the chlorine level up. We've dumped a lot of liquid into the pool lately, which will get the level up slightly, but 24 hours later it's gone. I've checked the SWG cell and it looks great, hardly any buildup at all. Can it just go bad and not generate any FC?
    16,000 gal in-ground Pebble-tec pool / Pebble-sheen spa. Jandy AquaPure 1400 SW Cl gen (SWG) system. In-floor cleaning system w/ Hayward 1.5HP Super II pump. Hayward 31" sand filter. 900 sq ft Heliocol solar panels w/ separate pump. Water feature with separate pump.

  2. #2
    Senior Member spishex's Avatar
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    Re: SWG Cell not working?

    It could, but if you're losing a substantial amount of chlorine over 24 hours then there's probably something consuming it faster than the SWG can generate it. How much have you been losing? Do an overnight FC test to see if you lose any chlorine while the sun is down. If so, bring your pool up to shock level with liquid chlorine (about 30ppm for you) and hold it there until you're no longer losing chlorine overnight.

    And just to be sure, get your salt level tested to double check the cell's reading.

  3. #3
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    Re: SWG Cell not working?

    I actually did a separate salt level test and it matched what the SWG sensor was reading (3600-3700) which is slightly above what Jandy recommends (3500). So I figured I was good there too. I'll max out the chlorine and see if that helps. Should have mentioned that two large areas of black algae have formed over the past three weeks. They retreat with the chlorine hits (I do brush them before I add the chlorine), but have yet to totally disappear.
    16,000 gal in-ground Pebble-tec pool / Pebble-sheen spa. Jandy AquaPure 1400 SW Cl gen (SWG) system. In-floor cleaning system w/ Hayward 1.5HP Super II pump. Hayward 31" sand filter. 900 sq ft Heliocol solar panels w/ separate pump. Water feature with separate pump.

  4. #4
    Senior Member polyvue's Avatar
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    Re: SWG Cell not working?

    Quote Originally Posted by hillyjd
    I actually did a separate salt level test and it matched what the SWG sensor was reading (3600-3700) which is slightly above what Jandy recommends (3500). So I figured I was good there too. I'll max out the chlorine and see if that helps. Should have mentioned that two large areas of black algae have formed over the past three weeks. They retreat with the chlorine hits (I do brush them before I add the chlorine), but have yet to totally disappear.
    Hello Hillyjd and welcome to the forum...

    Please read Defeating Algae in Pool School. I'm not familiar with the Jandy SWG you have on your pool but I can tell you that if the output is equivalent to the Hayward Aqua cell (producing about 1.45 lbs chlorine per day) you may never be able to get enough chlorine from the SWG to completely rid yourself of the algea... As spishex indicated, you'll have to introduce enough chlorine to get to very high shock levels, and then keep it there until the algea is all dead. This almost always necessitates the addition of liquid chlorine or 6% bleach == and in quantities. Would suggest following sphishex's succinct and specific recommendations. Good luck!
    14,555 gal in-ground 16'x29' white plaster Pool w/spa (2007); Goldline Aqua Logic AQL-PS-8 control w/Aqua Cell 15 Salt Water Chlorination (SWCG); Hayward TriStar 1HP (1.85 SF) main / 1.5HP (1.60 SF) spa pumps; Hayward Swimclear cart filter C4025, ColorLogic LED lights; Tankless SP-18-4 electric heater; Polaris 280 cleaner.
    __
    View of spiral galaxy in Ursa Major NGC6217 - Hubble Telescope 2009

  5. #5
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    Re: SWG Cell not working?

    Had my wife add clorox this afternoon while I was at work. Came home and chlorine level is between 5 & 8. Will check it again in the morning and see. Thanks for all your help.
    16,000 gal in-ground Pebble-tec pool / Pebble-sheen spa. Jandy AquaPure 1400 SW Cl gen (SWG) system. In-floor cleaning system w/ Hayward 1.5HP Super II pump. Hayward 31" sand filter. 900 sq ft Heliocol solar panels w/ separate pump. Water feature with separate pump.

  6. #6
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    Re: SWG Cell not working?

    To truly defeat the algae, you'll need to get the chlorine up to shock level which is dependant on your cya (see this chart). 10 ppm chlorine is shock for 20 ppm cya. If your cya is actually 70 ppm, you're WAY short of shocking your pool (referenced chart says shock level = 28). Remember shocking your pool is a process, not a product!
    20K gal IG vinyl 18'x36' rectangle, 2' radius corners
    Hayward Goldline Aqua Rite 40K SWG, Pentair Intelliflow VS 3050,
    Sta-Rite Cristal-Flo 24" Sand filter, Model T-240BP-1, Polaris 280 Auto Cleaner
    Sunstar solar panels (438 sq ft ), Pentair Sun Touch Controller automating solar panels, SWG, and Polaris
    TF-100 test kit

  7. #7
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    Re: SWG Cell not working?

    Welcome to TFP!!

    It sure sounds like you've got something trying to thrive in the pool Please follow the advice given to rid the pool of it and I'll bet you are back to a trouble free pool
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

  8. #8
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    Re: SWG Cell not working?

    I've been gone quite a bit lately and didn't get a chance to follow up. No matter how much chlorine I put in the pool, it was gone within a day or two. Then I noticed that I was getting an error code 178/182 on the SWB control box. I had seen this before and it would clear after I cleaned the sensor, which I did, but the error returned a day or two later, and was intermittent. To make a long story short, I finally ended up replacing the sensor, and now I have more chlorine in the pool than I can get rid of. I now believe the sensor was failing intermittently, which I am told by Jandy will turn off the cell. Working great (almost too good) now.

    It sure sounds like you've got something trying to thrive in the pool Please follow the advice given to rid the pool of it and I'll bet you are back to a trouble free pool [/quote]
    16,000 gal in-ground Pebble-tec pool / Pebble-sheen spa. Jandy AquaPure 1400 SW Cl gen (SWG) system. In-floor cleaning system w/ Hayward 1.5HP Super II pump. Hayward 31" sand filter. 900 sq ft Heliocol solar panels w/ separate pump. Water feature with separate pump.

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