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Thread: Help with SWG and chlorine level

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    Help with SWG and chlorine level

    I seem to be having a problem maintaining my FC level, here are my recent test results using TF100 kit

    FC - 0
    CC - 0.5
    TC - 0.5
    PH - 7.5
    TA - 70
    CYA - betweren 90 - 100 ( i know a bit high)
    CH - 200
    Salt 3400
    temperatur of water 63 degrees.

    My issue is with the SWG and if it is working properly, as well as my manual additions of chlorine.
    My VSP pump runs for 4 hours on 65% then another 8 hours on 35%
    My SWG is set for 65% This is where i start (maybe continue is a better word) to have questions.
    The SWG stops generating chlorine after 2 hours at the 65% speed with a message that percentage has been met.
    I have tested FC 2 hours after this message and get the 0 reading.
    I have ran the option for super chlorinate which runs the filter and SWG for 24 hours, this was done from 1:00pm - 1:00 pm following day.
    This gave me a FC reading of 9.5 (didn't test CC at thsi point)
    Later that evening at around 7:30 I had a FC level of 0.5. I would have thought that even in direct sunlight in 85 degree weather in NJ that the CYA of 90 - 100 would have held the level higher than that after 6 hours. Am I wrong in this assumption?
    I have even added 128oz of 8.25% bleach and got a reading of 3.5. This was at 5:00 in the evening on a seperate night, but the level didn't hold for longer than 2 hours, at which point i was down to 1.

    With this being my first pool, brand new construction and first time operating, I guess my main question is where do I go from here?
    22,300 gallon Inground Vinyl Liner pool
    Hayward DE 3620 filter Hayward Ecostar Variable Speed Pump
    1 Skimmer, 2 Main Drains, 2 Returns, 2 step Jets, 8 ft x 3ft waterfall

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    JasonLion's Avatar
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    May 2007
    Location
    Silver Spring, MD
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    Re: Help with SWG and chlorine level

    You almost certainly have a low level algae problem, enough algae to use up all your chlorine but not enough to be visually obvious. If you want you can confirm this by doing an overnight FC loss test, but the tests you have already done make it fairly obvious. You are going to need to shock the pool (see Pool School for instructions).
    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

    Re: Help with SWG and chlorine level

    Thank you. I think I will do the over night test just to confirm and wait for the weekemd before I shock it. Temps are going to drop the next couple of days and if I get the FC back in check the SWG will not generate chlorine because the temps will be too low.
    22,300 gallon Inground Vinyl Liner pool
    Hayward DE 3620 filter Hayward Ecostar Variable Speed Pump
    1 Skimmer, 2 Main Drains, 2 Returns, 2 step Jets, 8 ft x 3ft waterfall

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    Mod Squad jblizzle's Avatar
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    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Help with SWG and chlorine level

    The SWG stops due to the water temp. I would not think a couple cooler days would have that significant of an impact on the water temp ... unless you are already very close to the cut-off water temp.

    Review this if you have not done the OCLT before:
    pool-school/overnight_fc_test
    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
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  5. Back To Top    #5

    Re: Help with SWG and chlorine level

    Thursday night supposed to go back down to 40 degrees, Friday will struggle to get to 50 and rain all day. But looks like 60s all weekend and finally spring back to stay.
    22,300 gallon Inground Vinyl Liner pool
    Hayward DE 3620 filter Hayward Ecostar Variable Speed Pump
    1 Skimmer, 2 Main Drains, 2 Returns, 2 step Jets, 8 ft x 3ft waterfall

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