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Thread: SWG Question

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    SWG Question

    Could someone with a like setup (see singature) tell me what % they have their SWG set to. I do a 9 hour pump run per day and check the water every morning. My FC is at 6 now and I am trying to get it down to 4. I had the SWG set to 45 and just turned it down to 40 and would like to know if I am getting in the range I need to be beacause it seems to me going up about one half percent per day at 45. Thanks
    18X38 Grecian 26000 gallon In Ground Vinyl. Goldline AuqaRite SWG with a 1.5 HP Pentair Pump. Triton 2 Sand Filter Two main drains with 4 main returns with 2 more returns on the swimout and two skimmers. Polaris 380

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    JasonLion's Avatar
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    Re: SWG Question

    SWG percentage settings are not generally comparable between pools. There are so many factors that affect the required percentage that you will probably never match another pool exactly.

    When adjusting the percentage, you want to measure the FC level at the same time of day each time, preferably in the early evening. You also need to give it a couple of days to stabilize after any change.

    My guess is that you need to turn it down another 5%. But let it run and do the testing and find out for sure.
    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

  3. Back To Top    #3

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    Re: SWG Question

    It just seems low when the PB said to leave it around 70 but I knew better. I actually check it every morning at the same time. I keep adjusting it down but the FC seems to be going up the same every morning. Thanks
    18X38 Grecian 26000 gallon In Ground Vinyl. Goldline AuqaRite SWG with a 1.5 HP Pentair Pump. Triton 2 Sand Filter Two main drains with 4 main returns with 2 more returns on the swimout and two skimmers. Polaris 380

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    JasonLion's Avatar
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    Re: SWG Question

    You made a small change to the percentage, which might not cause a change of even 0.5 on the FC reading.

    The percentage you need to use will be significantly higher in the middle of the summer when the water is warmer and more swimming is happening. The builder was probably trying to anticipate that, assuming you wouldn't change the setting between now and then.

    Testing in the early evening is better, if it is practical for your schedule.
    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: SWG Question

    Quote Originally Posted by kenmccall
    Could someone with a like setup (see singature) tell me what % they have their SWG set to. I do a 9 hour pump run per day and check the water every morning. My FC is at 6 now and I am trying to get it down to 4. I had the SWG set to 45 and just turned it down to 40 and would like to know if I am getting in the range I need to be beacause it seems to me going up about one half percent per day at 45. Thanks
    As Jason has said, SWG percentage settings are not generally comparable between pools. There are so many factors that affect the required percentage that you will probably never match another pool exactly.
    When adjusting the percentage, you want to measure the FC level at the same time of day each time, preferably in the early evening. You also need to give it a couple of days to stabilize after any change.

    however, I happen to have a very similar setup, BUT OUR WATER WILL BE DIFFERENT.
    The PB left mine set at 50%, I dropped it down to 25% 2 summers ago, and currently have it running at 20% with a 14 hour pump run time.
    We've had at least 4 pool parties so far (teenagers! and I test 3-4 times during the parties). The FC levels have never dropped below 5.5. I'm figuring that I'll be changing it back to 25% or 35% during the heat of the summer.
    Make changes, wait a few days and see the difference. Remember that a 5% change is equal to a 5/60's of a change per hour: not much.
    Triad Region of NC
    18x37 Vinyl IG (24,000 gal.), BBB & GoldLine AquaLogic PS4 SWG, Hayward 1 HP Superpump / Hayward Sand Filter / Polaris 280 cleaner / 6 deck jets / Sheer Descent Waterfall (in coping) / Brick Red Concrete Coping / Stamped Concrete Deck
    Lots of oak trees, maple trees, *and* leaves!

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    Re: SWG Question

    Some pools with SWCGs have a low level infestation of something organic. This causes a higher than normal chlorine demand. The solution, unfortunately, in most cases is to up the setting on the SWCG. Because of this many people in the pool industry are used to very high settings on SWCGs. Two ways to check if you have this situation: First is to calculate your daily chlorine production and from that you daily chlorine demand. should be around 2 ppm. The second is to check your chlorine loss over night. Should be 0.5 ppm or less.
    7,500 gal, IG pool, L shape 22' x 15', 1.5 hp pump, cartridge filter, AquaPlus SWG/Controller, Pebble-Tec liner.

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    Re: SWG Question

    Quote Originally Posted by dschlic1
    Some pools with SWCGs have a low level infestation of something organic.
    I believe it's called "The In-laws"!

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    Re: SWG Question

    Quote Originally Posted by waterbear
    Quote Originally Posted by dschlic1
    Some pools with SWCGs have a low level infestation of something organic.
    I believe it's called "The In-laws"!
    Are you saying all I have to do to cure this type of infestation is to turn up the percentage on the SWG?
    17000 gal free form plaster pool with 900 gal spillover spa, shared 2 HP 2 speed pump, cartridge filter, Pentair IC40 SWG, solar and gas heater, 1 hp pump for water features, 1.5 hp pump for spa. Dolphin Diagnostics robotic cleaner.

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