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Thread: SWG and very little chlorine

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    Join Date
    Jul 2013
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    Tampa,Florida
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    SWG and very little chlorine

    So I've had my pool for about 3 months now and the last month or so I have very little chlorine at the end of the day. Pool is in sun all day. Pump runs from 9am to 8pm with SWG at 55 percent. This setting had worked great for about a month or so. I have the Tf 100. Results are
    FC 0
    CC 0
    PH 7.8
    TA 110
    CH 400
    CYA 70
    Salt 3100 via pool pilot and pool store

    I have a dark finish so I can't see anything on the walls and the water is clear, just no chlorine. I have added liquid chlorine occasionally to help. Pulled apart salt cell and it is clean. Even called pool pilot and discussed the volts and amps to the cell which they said was fine. They asked me about phosphates which I had the pool store check and it was at 3000 which is high. I have since lowered to about 300. Just started to slam overnight with chlorinator off. When I went to sleep around 11pm my FC was 20 and cc was 0. When I woke up and checked around 630 FC was 12 and cc was .5.
    So something must be in the water correct? What about cc only being .5. I continued to slam and overnight it dropped only 3 points. Am I doing this correct. Almost wish I didn't have the salt cell but the chlorinator that you add the pucks to at the pump.
    11,000 gallon, IG, Stonescapes Tahoe blue pebble finish, Pentair clean and clear 150, Pentair vs pump, pool pilot nano salt chlorinator.

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    Join Date
    Jun 2012
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    Howell, NJ
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    Re: SWG and very little chlorine

    There's something growing in your water. You have to follow the SLAM process. It is best to leave the SWG off. Once you are done with SLAM, the SWG should be able to keep up better.
    John
    7 year old ~13,500 gal 24' AGP with 1.5 hp Proline pump, 150 sqft Pleatco cartridge, filled with well water with pH of about 4.5.
    Wanda the Whale pool vacuum, home made heater, Taylor K-2006
    Cloudy Pool? 1) Order test kit. 2) Follow SLAM
    New to TFPC? Read Pool School a few times, then post questions. PoolMath will help with chemical additions.

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    pwrstrk's Avatar
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    Aug 2012
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    Elverson Pa.
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    Re: SWG and very little chlorine

    You don't want the chlorinator, your SWG will do fine once your pool is clear.

    Make sure your following the SLAM process to the T. The more you can maintain shock level the quicker this will go for you.
    pool-school/shocking_your_pool
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    linen's Avatar
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    Re: SWG and very little chlorine

    Welcome to tfp, titanium10k

    The nano is rated for 22000 gallons over a 24 hour period. You are only running it for 11 hours at 55%, so in theory it will only chlorinate a 5500 gallon pool. I would guess you need to run it closer to 12 hours at 100%.

    That's not to say you don't have something in your water though. I would manually chlorinate with bleach/liquid chlorine to bring your FC up to at least 8 ppm, then do a Overnight Chlorine Loss Test (OCLT) with the swg off but the pump running. See: http://www.troublefreepool.com/pool-...rnight_fc_test
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: SWG and very little chlorine

    Quote Originally Posted by linen
    Welcome to tfp, titanium10k

    The nano is rated for 22000 gallons over a 24 hour period. You are only running it for 11 hours at 55%, so in theory it will only chlorinate a 5500 gallon pool. I would guess you need to run it closer to 12 hours at 100%.

    That's not to say you don't have something in your water though. I would manually chlorinate with bleach/liquid chlorine to bring your FC up to at least 8 ppm, then do a Overnight Chlorine Loss Test (OCLT) with the swg off but the pump running. See: http://www.troublefreepool.com/pool-...rnight_fc_test

    I did the test at 20 and it dropped to 12 the next morning. Once I am complete I will play with the percentage more. Seems crazy it would need to be at 100 percent though.

    Thanks for the help.
    11,000 gallon, IG, Stonescapes Tahoe blue pebble finish, Pentair clean and clear 150, Pentair vs pump, pool pilot nano salt chlorinator.

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    linen's Avatar
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    Re: SWG and very little chlorine

    Quote Originally Posted by titanium10k
    Seems crazy it would need to be at 100 percent though.
    Not crazy if you look at the specs. With that said, you have a significant organic issue in your pool...it is possible when you clean that up that you can run you swg less than I postulated above. Once you are done with the SLAM process, I would look at running your swg closer to 100% and minimize your pump run time. See: http://www.troublefreepool.com/pool-.../pump_run_time
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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