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Thread: SWG FC Generation Level @100% / Super Chlorinating - "The Norm"

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    hoskim's Avatar
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    SWG FC Generation Level @100% / Super Chlorinating - "The Norm"

    What is the "normal / typical" level of FC being generated by a salt cell (I have Hayward T-CELL-9) at 100% / Super Chlorinating. Although I have gone through SLAM twice, I continue to experience FC loss (even with CYA of 70-80).

    While recognizing my test was not exactly accurate / scientific, I placed (with my thumb to cover) a sample tube and syringe in front of my return to capture the FC level (tube = 2.0, syringe = 2.5). All indicators are within range and my salt level is 3400 ppm. My cell is exactly three years old and being used 3-4 months a year.

    Is this normal?

    Thanks!
    25,000 Gal, in-ground w/ vinyl liner
    Hayward SP2303VSP (1.5 HP) / DE filter (4820)
    Aqua Rite SWG / T-CELL-9 (v1.5)
    Polaris 380, PB4-60 Booster Pump (post-2012) / Aqua Heat Pump (S95)
    TF-100 Test Kit with Speedstir

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    Re: SWG FC Generation Level @100% / Super Chlorinating - "The Norm"

    How many hours a day are you running your swg?

    We recommend that your swg be 2 to 3 times the size of your pool. Your cell is a little small and you would need to increase the hours your pump runs. A larger cell can provide enough chlorine with much less pump run time.

    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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    hoskim's Avatar
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    Re: SWG FC Generation Level @100% / Super Chlorinating - "The Norm"

    Oh..yeah...for got to mention. At least 10 hours...10AM to 8PM but I have run more (like 24 hours) in the past frequently. The previous owner indicated he ran 9 - 5 with no issues so I am wondering whether my cell is "bad." Also I doubt our pool is 25K as the previous owner claimed and closer to 20,000 - I have noticed this when I was adding salt and CYA (that the calculation based on 25K was a bit too much). May be I should consider buying a T-CELL-15 when this one goes....Thanks!
    25,000 Gal, in-ground w/ vinyl liner
    Hayward SP2303VSP (1.5 HP) / DE filter (4820)
    Aqua Rite SWG / T-CELL-9 (v1.5)
    Polaris 380, PB4-60 Booster Pump (post-2012) / Aqua Heat Pump (S95)
    TF-100 Test Kit with Speedstir

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    Mod Squad pooldv's Avatar
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    Re: SWG FC Generation Level @100% / Super Chlorinating - "The Norm"

    The most common cause for an SWG "not keeping up" is some algae in the water consuming FC. It is easy enough to test for it, shut off the SWG and do an Overnight Chlorine Loss Test to see if there is something brewing in the water. If it doesn't pass then give the pool a quick SLAM
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    hoskim's Avatar
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    Re: SWG FC Generation Level @100% / Super Chlorinating - "The Norm"

    Thanks for your advice and i was afraid of going through SLAM again (which actually worked well in the past). But difficult to think that SWG "only" generates 2.5 FC at Super Chlorinating mode while Hayward indicates "if you want to shock the pool......"

    25,000 Gal, in-ground w/ vinyl liner
    Hayward SP2303VSP (1.5 HP) / DE filter (4820)
    Aqua Rite SWG / T-CELL-9 (v1.5)
    Polaris 380, PB4-60 Booster Pump (post-2012) / Aqua Heat Pump (S95)
    TF-100 Test Kit with Speedstir

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    Re: SWG FC Generation Level @100% / Super Chlorinating - "The Norm"

    The T-9 cell is way undersized for your 25,000 gallon pool. That may be your problem.
    16 x 32 17500 gallons
    Vinyl in-ground
    Hayward 250# Sand Filter
    1 HP Pump
    Hayward SWG

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    Re: SWG FC Generation Level @100% / Super Chlorinating - "The Norm"

    Got it and so much for mfg's capacity recommendation..i guess i need a t cell 15 then...
    25,000 Gal, in-ground w/ vinyl liner
    Hayward SP2303VSP (1.5 HP) / DE filter (4820)
    Aqua Rite SWG / T-CELL-9 (v1.5)
    Polaris 380, PB4-60 Booster Pump (post-2012) / Aqua Heat Pump (S95)
    TF-100 Test Kit with Speedstir

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    Re: SWG FC Generation Level @100% / Super Chlorinating - "The Norm"

    The manufacturers recommendations are based on running 24/7 at 100%.

    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: SWG FC Generation Level @100% / Super Chlorinating - "The Norm"

    Understood and that's a great insight....(while recognizing my ignorance being a first year pool owner, nevertheless), I feel like a car manufacturer claiming 100 MPG with a fine print...."only if you drive downhill"
    25,000 Gal, in-ground w/ vinyl liner
    Hayward SP2303VSP (1.5 HP) / DE filter (4820)
    Aqua Rite SWG / T-CELL-9 (v1.5)
    Polaris 380, PB4-60 Booster Pump (post-2012) / Aqua Heat Pump (S95)
    TF-100 Test Kit with Speedstir

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    Re: SWG FC Generation Level @100% / Super Chlorinating - "The Norm"

    I like your analogy! I may have to steal it.

    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: SWG FC Generation Level @100% / Super Chlorinating - "The Norm"

    Hahaha..thanks...
    25,000 Gal, in-ground w/ vinyl liner
    Hayward SP2303VSP (1.5 HP) / DE filter (4820)
    Aqua Rite SWG / T-CELL-9 (v1.5)
    Polaris 380, PB4-60 Booster Pump (post-2012) / Aqua Heat Pump (S95)
    TF-100 Test Kit with Speedstir

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    Mod Squad jblizzle's Avatar
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    Re: SWG FC Generation Level @100% / Super Chlorinating - "The Norm"

    Well, no one ever really answered your question with numbers:

    A T-9 running 24 hours at 100% will generate 0.7 pounds of chlorine gas.
    In a 25k pool, that would be 3.4ppm of FC.

    A normal clear pool loses 2-4ppm of FC every day. So, I would expect for you to have to run your SWG at 100% for close to 24 hours a day to maintain adequate FC.

    FYI, the T-15 has double the output (1.4 pounds per day).
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: SWG FC Generation Level @100% / Super Chlorinating - "The Norm"

    Thanks!! Where did u get these numbers? I tried to find the figures but just couldnt..hence the posting....thanks again!!
    25,000 Gal, in-ground w/ vinyl liner
    Hayward SP2303VSP (1.5 HP) / DE filter (4820)
    Aqua Rite SWG / T-CELL-9 (v1.5)
    Polaris 380, PB4-60 Booster Pump (post-2012) / Aqua Heat Pump (S95)
    TF-100 Test Kit with Speedstir

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    Mod Squad jblizzle's Avatar
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    Re: SWG FC Generation Level @100% / Super Chlorinating - "The Norm"

    The 0.7 pounds is published information. HERE is one source.
    I then used the "Effects of adding chemicals" section of PoolMath to calculate the FC ppm addition.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    hoskim's Avatar
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    Re: SWG FC Generation Level @100% / Super Chlorinating - "The Norm"

    Thanks again! Great info...I am opening my wallet now...reluctantly.....
    25,000 Gal, in-ground w/ vinyl liner
    Hayward SP2303VSP (1.5 HP) / DE filter (4820)
    Aqua Rite SWG / T-CELL-9 (v1.5)
    Polaris 380, PB4-60 Booster Pump (post-2012) / Aqua Heat Pump (S95)
    TF-100 Test Kit with Speedstir

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    Re: SWG FC Generation Level @100% / Super Chlorinating - "The Norm"

    JBlizzle has it right.

    I am calculating 21.5 hours required to run with a daily FC loss of 3 PPM @ 100% output. If you have a day with a PPM loss of 4 or more PPM, the SWG cannot generate enough Chlorine. At 4 PPM loss, 28.7 hours would be required.

    If I were you, for now, I would do one of 2 things, both require daily addition of Bleach.

    1. Run the pump 15 hours a day to replace 2 PPM each day and test daily and add bleach as required. Some days, it might not be needed.
    or
    2. Run the pump as little as needed, lets say 6 hours and test daily and add bleach each day.
    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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    hoskim's Avatar
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    Re: SWG FC Generation Level @100% / Super Chlorinating - "The Norm"

    This is really helpful and thanks!!
    25,000 Gal, in-ground w/ vinyl liner
    Hayward SP2303VSP (1.5 HP) / DE filter (4820)
    Aqua Rite SWG / T-CELL-9 (v1.5)
    Polaris 380, PB4-60 Booster Pump (post-2012) / Aqua Heat Pump (S95)
    TF-100 Test Kit with Speedstir

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