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Thread: Losing FC with SWG on High

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    Join Date
    Apr 2013
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    Losing FC with SWG on High

    I think my salt cell may need to be replaced, but you tell me what you think. I was recently SLAMming to get of some mild algae and I performed an OCLT, but forgot to turn my SWG off. Instead, with it running on high, I still lost like 5 FC overnight.

    The algae problem is cleared up now (OCLT passed thanks to many gallons of bleach), but I've been watching my chlorine levels slowly drop ever since, even with the SWG still running with a high %. It's showing a salt level of 3000, so it's not that.

    Perhaps it just needs a good acid wash. When I get some free time, I'll take a look at the plates to see if there's any calcification, but this seems like a strong effect for just a little calcification.

    I bought this house in 2013 and I know the pool was built in 2008, but don't know if the previous owners ever replaced the cell, so it's somewhere between 2-7 years old.
    ~15k gal IG pebble pool/spa w/ water features, Goldline ProLogic + SWG, 2x Hayward Northstar pumps, Hayward Booster Pump, Hayward 60sqft DE filter, 400k BTU Hayward heater, Hayward Viio Turbo pool cleaner, TF100 test kit

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    Mod Squad tim5055's Avatar
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    Re: Losing FC with SWG on High

    If it's 2 it died prematurely, If it's 7 it had a long healthy life.

    Until you sort it out you need to stay on top of the chlorine with liquid.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Losing FC with SWG on High

    I would clean it with vinegar or MA before chalking it up to a total loss. But if you lost that much running at 100% there is an issue, no doubt. But if it is 7 years old, I would say you got a lot of life out of it.

    I assume that your cya and salt are in an acceptable range? My SWG likes 3200-3400. Not sure on yours or if that little off would cause an issue???

    30x20 vinyl IG, Hayward SD60 with Pentair Dynamo 340219 2HP pump, Compupool CPSC24 SWG, Hayward H200FDN heater. APC automatic pool cover.
    Central Illinois

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    ffournier's Avatar
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    Re: Losing FC with SWG on High

    What SWG do you have? Does it have a cell light on it? I have an Intellichlor IC40. It has a green cell light that lights up when the cell is producing chlorine. If I set mine at 100% that light would be lit all the time. If you have no indication telling you that the cell is actually producing chlorine, your falling FC level is telling you it's not, regardless of were your percentage is set. I'm assuming you have cleaned the cell at least a few times sinse you bought the house?
    25K gal saltwater gunite and Pebble Tech plus built in spa. Features-Weeping rock wall, and fountains. All Pentair equipment. Main pump- Intelliflo 4/160. Feature pump- Intelliflo 2hp single speed. Aux cleaner pump-Pentair 1hp. DE filter, Pentair heater, Glacier GCP210 pool chiller.

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    JasonLion's Avatar
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    Re: Losing FC with SWG on High

    What is your CYA level? If CYA is too low the SWG won't be able to keep up with sunlight losses.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Losing FC with SWG on High

    Quote Originally Posted by JasonLion View Post
    What is your CYA level? If CYA is too low the SWG won't be able to keep up with sunlight losses.
    CYA is 60. Salt is 3000, which is the recommended level for the Hayward T-15 iirc
    ~15k gal IG pebble pool/spa w/ water features, Goldline ProLogic + SWG, 2x Hayward Northstar pumps, Hayward Booster Pump, Hayward 60sqft DE filter, 400k BTU Hayward heater, Hayward Viio Turbo pool cleaner, TF100 test kit

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