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Thread: Constantly changing SWG output to keep FC in line

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    Miamipool's Avatar
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    Constantly changing SWG output to keep FC in line

    I have a Jandy SWG and constantly have to adjust the output to keep FC in 3-5 range. Is this typical ? get one cloudy day her in Miami and FC goes to 7, bright sunny day below 3.
    ref. CYA 70-80, ph 7.6, salt 3000 ppm, TA 60-70. Would be easier to just add bleach daily.
    9000 gal, Florida Gem finish, Jandy (2 hp one speed pump, 340CV Cart. filter, SWG), AuquCal Heatwave heater/ chiller, water fall spa, coral stone decking.

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    Re: Constantly changing SWG output to keep FC in line

    What test kit are you using?

    Are you testing at the same time each day?

    Do you have a constant swim load and any kids using 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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    Miamipool's Avatar
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    Re: Constantly changing SWG output to keep FC in line

    K-2006, usually test around 8am. swim load is not constant, kids fri, sat, sun. adults hot tub couple times a week.
    other than that water is super clear and no CC detected.
    9000 gal, Florida Gem finish, Jandy (2 hp one speed pump, 340CV Cart. filter, SWG), AuquCal Heatwave heater/ chiller, water fall spa, coral stone decking.

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    kcindc's Avatar
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    Re: Constantly changing SWG output to keep FC in line

    Sometimes it is easier to add a little extra bleach after a large swim load like on the weekends or after soaking in the hot tub vs having to constantly adjust your SWG %. I run my SWG from the early morning hours until just after noon. I test FC in the evening which is usually at the lowest FC levels. I notice if I test mid-morning, my FC levels are higher.

    I don't adjust my SWG if my FC gets a little high which is usually after a few overcast days. I know it will all even out after several blazing hot days.

    You probably want to keep your CYA near 80 vs 70, too.
    Karen
    33K IG w spa plaster, Pentair 1HP Whisperflo, DE Filter, SWG CircuPool RJ-60, Dolphin Triton Plus, Raypak Dig 336K BTU, TF-100.
    Pool Math Chlorine / CYA Chart SLAM - Shock Level And Maintain
    2017 replaster/retile

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    Re: Constantly changing SWG output to keep FC in line

    Keep track if you are seeing the drop without anyone swimming on the sunny days.

    If you do get a drop without anyone swimming then I would target 80 for the CYA.

    If you only see a drop when you have swimmers then I would say they need to use the potty and not go in 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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    Mod Squad Jimrahbe's Avatar
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    Re: Constantly changing SWG output to keep FC in line

    Miami,

    Why are you trying to stay between 3 and 5? While 3 is the absolute minimum, 5 is not the maximum. I run about 6 to 8 most of the time and this allows me not to pay much attention for a few days without having to worry that the FC will drop too low. Much easier to stay above the target valve than it is to try and stay between the minimum and target valves.

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Calder Spa.

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    Re: Constantly changing SWG output to keep FC in line

    Quote Originally Posted by Jimrahbe View Post
    Miami,

    Why are you trying to stay between 3 and 5? While 3 is the absolute minimum, 5 is not the maximum. I run about 6 to 8 most of the time and this allows me not to pay much attention for a few days without having to worry that the FC will drop too low. Much easier to stay above the target valve than it is to try and stay between the minimum and target valves.

    Jim R.
    This is what I am finding as well. You just can't run it too close. You need to have a little buffer in there so that on average over several days, it equals out. Some days will need a little more and some a little less.
    Matt
    2016 Pool Build: 12k IG Blue Granite Pebblesheen, Travertine Coping & Pavers, Pentair IntelliFlo, Intellichlor, Easytouch, Clean & Clear 320, Heliocol Solar - TF-100 test kit w/ SpeedStir
    SWG Run Time Calculator

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    Re: Constantly changing SWG output to keep FC in line

    Just because PoolMath says you can run a lower FC with a SWG doesn't mean you have to. The pool is safe and usable anyplace between the minimum FC and shock level. You will drive yourself nuts adjusting up and down trying to keep it in a narrow range, besides you run the risk of it getting below the minimum (algae or unsafe water). I agree with others, set your average a bit higher and don't worry if it's occasionally a bit above the ideal target range.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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