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Thread: Decreasing SWG output??

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    Join Date
    Feb 2013
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    Jupiter, Florida
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    Decreasing SWG output??

    Latest numbers below, about as good as I can get it with one exception, Total Chlorine. When I went by pool store numbers I had the SWG set at 70%. When I started adjusting numbers to TFP levels it was way high, 14-15. So I turned it all the way off and over a few days it dropped to 4. Didn't want it to go any lower so I turned to 60% and Total Chlorine started climbing. Down to 50%, still climbing. Now that I have gotten my numbers in pretty good balance and stable for a few days I apparently need to lower it more (or run pool less). Going to go down to 30% today and see what happens.

    Is this a normal occurrence when adjusting? Less need for cholrine output or addition? I have read Pool School through and through but can't really see what would drive it. A good thing to have happen though as my SWG is 10 years old and needs a rest.

    FAC - 10
    CC - 0
    TAC - 10
    CH 370
    CYA 78
    TA - 70
    pH - 7.5
    Borates - 50
    Salt - 3200
    Temp - 81
    2006 IG 18.6K gal marcite saltwater w/integrated 800 gal spa, spillover, 2 Main and 2 Spa Drains, 2 Skimmers
    Goldline Aqua Logic PS-8, Aqua Pod Remote, Hayward GLX-Cell-15-W SWG, Hayward Pool Vac XL, Cartridge filter, single speed pump
    Taylor K-2006, Lamotte Borate Strips

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    pabeader's Avatar
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    Re: Decreasing SWG output??

    There are a number of factors that drive FC use. Most are related to the time of year. As it gets colder, the sun will burn off less, the colder water slows down algae growth and other effects like that. Plus as your water is getting better balanced, it is possible that there was some scaling on the cell, that has started to clear off. It is normal to need to adjust the % over the course of the year. A thing to note is that, for most SWGs, the % is based on run time/on time per hour. So, in your case for example, if the unit is on for 1 hour 30% of the time, it will be generating chlorine.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals Pentair 320 cartridge filter (all new guts installed by me) Goldline SWG Intermec 104 TImer Test kit K-2006-C

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    Re: Decreasing SWG output??

    Your FC is going up because you're either putting more chlorine into the pool, or the demand for chlorine of the pool has decreased.

    Things that will increase chlorine output from SWG are:
    Lowering pH
    increasing NaCl
    increasing temperature


    Chlorine use will be decreased by

    Having nothing growing in the pool (SLAM, getting chemistry right)
    Fewer swimmers, particularly children who urinate and do other things in the water
    Less sun
    More CYA
    Lower temperature

    Have any of these changed?

    Edit: previous post while I was writing mine said mostly the same, sorry.
    ​GeoQuack
    Melbourne, Australia. Plaster pool 44,000 Litre (11,625 US gallons), 2 HP 1 speed pump, Zodiac LM3-40 SWG, Zodiac CX20 robotic cleaner, PoolSkim, solar heating, sand filter, clearchoicelabs.com.au test kit (TF100 or taylors not available in Australia), big eucalypt that drops infinate leaves, gum nuts, pollen and sticks into pool

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    Re: Decreasing SWG output??

    FWIW, my swcg is usually set at 10% and keeps the FC at around 7. We also don't have small kids using it constantly either.
    Marla
    No longer living vicariously through other people's pool builds. Pool build is complete on my IG SWCG pool, approx 10,000 gallons. All Jandy equipment - VS 1.5 hp pump, 580 cartridge filter, AquaPure 1400 salt cell, AquaLink PDA system. Dolphin m500. PebbleSheen Blue Surf with shells and beads added. TF-100 w/ SpeedStir. A Houston Pool Build Inside the Loop

  5. Back To Top    #5

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    Re: Decreasing SWG output??

    Thanks guys. Looks like a combination of things. I have had all of those:

    Gotten the chemistry right
    Fewer swimmers
    Less sun
    More CYA
    Lower temperature

    CYA was low so it got a lot of adjustment, temps are beginning to go lower, first time I have seen under 80 degreesin the morning, etc. The reality is that I didn't have much control over the pool and it has probably been real high for quite a while. Now that I have the tools I can adjust to what I should have been adjusting for 3 years ago. Adjusted to 30%, will check it agian this weekend and see whats up. Or down hopefully.
    2006 IG 18.6K gal marcite saltwater w/integrated 800 gal spa, spillover, 2 Main and 2 Spa Drains, 2 Skimmers
    Goldline Aqua Logic PS-8, Aqua Pod Remote, Hayward GLX-Cell-15-W SWG, Hayward Pool Vac XL, Cartridge filter, single speed pump
    Taylor K-2006, Lamotte Borate Strips

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    kywildcats's Avatar
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    Re: Decreasing SWG output??

    Quote Originally Posted by Marlahoutex View Post
    FWIW, my swcg is usually set at 10% and keeps the FC at around 7. We also don't have small kids using it constantly either.
    How long do you run your pump??
    Mark
    20'x28' IG, Vinyl, (Sept 2015) 14,900 Gallon, 3'4 to 5'6 deep, SPLAPOOL 1.5 HP, 220v, 2 speed pump, Waterway Carefree 27" 400 LB Sand filter, Digital Nano plus SWG, TF-100 test kit /speed stir. Dolphin Primal x3 robotic cleaner

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    Orlando
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    Re: Decreasing SWG output??

    You might check out this link for run time calculator, it helped me dial in my SWG. This time of year FC burnoff is pretty low for me.

    http://www.troublefreepool.com/threa...G-Pump-Runtime
    Phil
    ~9600 gal gunite pool, NEW July 2015; Pentair Intelliflo 2 VST pump; Pentair C&C 150 filter; Pentair Intelliclor IC40 swg; solar heat w/ Pentair Solartouch controller, screened. Taylor K 2005 test kit, FAS-DPD separate test, Taylor K1766 salt test

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    Re: Decreasing SWG output??

    With most residential pools most of the FC depletion is from the sun. At this time of year the sun is not nearly as intense, even if there are hot days, so the FC does not get consumed as fast.

    The SWG will likely need to be adjusted every month or turned off in most pools as winter sets in.
    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

  9. Back To Top    #9

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    Re: Decreasing SWG output??

    Summer time I run it 8 hours a day. About this time I dial it back some. I think I will give 6 hours a day a try and see what my numbers are.

    - - - Updated - - -

    I'm in south Florida so..odd as it may seem to some..we tend to use the pool less in the summer. Water is so warm it s not much more than a big bath tub. In the winter is when the family and friends come down from up north. While it may seem cool or cold to us it feels great to them because they left sub freezing temps up there and want to swim...
    2006 IG 18.6K gal marcite saltwater w/integrated 800 gal spa, spillover, 2 Main and 2 Spa Drains, 2 Skimmers
    Goldline Aqua Logic PS-8, Aqua Pod Remote, Hayward GLX-Cell-15-W SWG, Hayward Pool Vac XL, Cartridge filter, single speed pump
    Taylor K-2006, Lamotte Borate Strips

  10. Back To Top    #10

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    Re: Decreasing SWG output??

    Thanks for the link. Something on here I have not seen. Will try to nail down my chlorine loss over the next week or two. I guess the best way to do that is just turn off the SWG and test every 24 hours for a few days?
    2006 IG 18.6K gal marcite saltwater w/integrated 800 gal spa, spillover, 2 Main and 2 Spa Drains, 2 Skimmers
    Goldline Aqua Logic PS-8, Aqua Pod Remote, Hayward GLX-Cell-15-W SWG, Hayward Pool Vac XL, Cartridge filter, single speed pump
    Taylor K-2006, Lamotte Borate Strips

  11. Back To Top    #11

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    Re: Decreasing SWG output??

    Sounds like a good plan to me.
    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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