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Thread: Low chlorine production

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    Low chlorine production

    Hello,

    I recently moved to a property with a salt water chlorine generator. I replaced the cell about a month ago. The chlorine production is very low (0.5 ppm). There are no error messages on the display.

    Equipment:

    16000 gallon in ground pool - marsite
    Digital Pool Pilot
    SC-36 cell
    Pent air Sand filter
    2hp pump

    The pump runs every day for 9 hours. The display shows the following:

    Minerals 3000ppm
    Power level 2
    19V 6.5A
    Purifier at 100% (always runs at 100%)


    The water test shows the following:

    Free Chlorine 0.5
    Ph 8.0 (added 1 quart of Muriatic acid)
    Acid demand 3
    Total alkalinity 100ppm
    Calcium hardness 235ppm
    Stabilizer 80ppm
    Total dissolved solids 3900ppm
    Salt 2700ppm

    I am a novice, but it seems all ok to me so why is the chlorine production so low? The kit shows a different salt level than the pool pilot, but would this be a problem?

    The water is slightly cloudy, but has not turned green although when I brush each week there is a very light green mist.

    All suggestions greatly appreciated. Also, should I shock the pool each week with a salt water chlorine generator? If so, with liquid or powder?

    Many thanks in advance

  2. Back To Top    #2
    Mod Squad JohnT's Avatar
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    Re: Low chlorine production

    Welcome to TFP!

    Quote Originally Posted by Dogcalleddill
    The water is slightly cloudy, but has not turned green although when I brush each week there is a very light green mist.
    Chances are the algae is consuming the chlorine faster than your generator can produce it. Grab a water sample from a return and test that to see if has more chlorine in it.

    Either way, you will be needing to SLAM your pool. Read about it at SLAMing Your Pool
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    linen's Avatar
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    Re: Low chlorine production

    Welcome to tfp, Dogcalleddill

    As JohnT said, you need to do the SLAM process to eliminate the algae...then it is likely the swg will be able to keep your FC up. Do the SLAM process with bleach/liquid chlorine.

    Weekly shocking of a pool is not necessary if proper FC levels (for your cya level) are maintained.
    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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    Mod Squad jblizzle's Avatar
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    Re: Low chlorine production

    Welcome to TFP!!!

    Given that you reported total dissolved solids, I am going to assume that those test results are from a pool store which we have found to be notoriously inaccurate. If you do in fact have your own kit, which one? If not, your first step will need to be ordering one of the Recommended Test Kits to allow you to understand your pool's water and take control.
    Jason, TFP Moderator
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    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    JoshU's Avatar
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    Re: Low chlorine production

    Quote Originally Posted by Dogcalleddill
    19V 6.5A
    These are perfect amps and volts for an SC-36 (RC-35) cell at power level 2 so it appears that system is producing and working properly.
    Josh Ulfers - josh@saltpoolguys.com - 888-725-8766
    SaltPoolGuys.com - AutoPilot Pool Pilot Systems, Parts & Cells - AquaCal Heat Pumps

  6. Back To Top    #6

    Re: Low chlorine production

    Thank you al so much for your responses! The test results are from Pinch a Penny. I test the water there each week. I will test the water directly from the return and let you all know. Thanks again!

  7. Back To Top    #7

    Re: Low chlorine production

    I forgot to mention that I live in Florida and the water temperature is 87 so maybe the algae production is higher because of the climate?

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    Mod Squad jblizzle's Avatar
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    Re: Low chlorine production

    Pool store testing is notoriously inaccurate. Best path forward is to order one of the recommended test kits and trust your own accurate and repeatable testing.
    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!

  9. Back To Top    #9
    pwrstrk's Avatar
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    Re: Low chlorine production

    With higher water temp your chlorine loss will be greater. Thus algae can get a foot hold easier. With higher water temps you need to stay on top of your FC levels.
    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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