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Thread: Chlorine reading zero

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    Chlorine reading zero

    I'm new to having a pool and everything has been running smoothly the last six week until we got hit with 104 degree weather and decided to spend two days in the pool. Now my water is super cloudy and I am getting a zero reading for chlorine. I even had it on super chlorinate last night for 8 hrs. My salt cell is only 2 months old so I don't know why it wouldn't be producing.

    Here are my numbers: FAC 0. TAC 0. Salt 3400. CYA 35. TA. 80. pH 7.4. Phosphates 0

    I know my CYA is low too.

    I hope this is the correct place to post this


    10,000 gallon vnyl pool, Aquarite T-15 cell, Hayward Tristar VS , Swimclear c3030

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    Re: Chlorine reading zero

    Where did you get your test results from?

    I don't rely on my SWG's superchlorinate setting to do anything but lower the life of the SWG. A SWG is used to maintain a FC level that is normal. Going from 0 to 5.0 or so, I'd use bleach.

    With 104 degree temps, I assume lots of sunlight. Sunlight burns off chlorine if your CYA isn't high enough (this site recommends 70 - 80 for a SWG pool). With my cover on, I see a FC around 7, with it off it drops to 5.
    16 x 32 17500 gallons
    Vinyl in-ground
    Hayward 250# Sand Filter
    1 HP Pump
    Hayward SWG

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    Scuba_Steve's Avatar
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    Re: Chlorine reading zero

    Lets keep that CYA low for right now. Dont add any more.

    You will need to get in some bleach to get i to sanitary levels. I would get it to 5 immediately.

    There is a good chance you have some algae living in your pool which is why your salt cell can not keep up. More than likely you will need to SLAM.

    Here are the directions: SLAM Directions

    First though, lets verify with an OCLT. Here are the directions for that: OCLT Directions

    If you fail the OCLT, then begin SLAMing. Turn off your SWG at this point and just use bleach.

    BTW, what are you testing with?

    - - - Updated - - -

    Oh and make sure your SWG is not running during your OCLT!
    6425g Intex Ultraframe 18'x48" AG
    Stock 1500gph cartridge filter / Intex SWG CG-28669 with E.C.O.
    Install date: 5/26/2015
    TF-100
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    Re: Chlorine reading zero

    I got the test results from Leslie's after using my strips and hth 3 way drop kit . I just ordered the Taylor 2006 kit off amazon after skimming through posts here on the forum.

    I'm going to read the articles posted above and go buy some bleach.

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    Re: Chlorine reading zero

    Good thing. You will absolutely need it to successfully SLAM. It will save you a ton in the end. You took the first big step to never trusting the pool store again!

    The next step is to become very fluent with the procedure in Pool School.

    Read it as many times as it takes to know it like the back of your hand. One of the most important things is the Chlorine/CYA Chart. Also you will find that the Pool Math Calculator will become your best friend.
    6425g Intex Ultraframe 18'x48" AG
    Stock 1500gph cartridge filter / Intex SWG CG-28669 with E.C.O.
    Install date: 5/26/2015
    TF-100
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    Re: Chlorine reading zero

    I am sure this is a dumb question, but since I have a SWG and my CYA level is 35, what would be my shock level since its not on the chart? Do I just add liquid bleach until I get a higher FC reading, with my generator off?

    I like to think I am an intelligent person, but I am sure having a hard time with this.

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    Re: Chlorine reading zero

    Using the pool calculator I should add 83 oz of 6 % bleach. Do I keep my swg system running?

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    Mod Squad JVTrain's Avatar
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    Re: Chlorine reading zero

    Most people turn off their SWCG during a SLAM procedure and I'd recommend that as well. You're going to be adding much more chlorine manually than your SWCG provides and you may as well save the life on the cell. Your pump MUST be running throughout the entire SLAM.

    Wait until you get your own proper CYA test before starting the SLAM. Leslie's may have said your CYA was 35 but it could be 20. It could be 50. It could be 120. It could be 200. It could be 0. You need to test this yourself to get an accurate number before proceeding. Until your kit arrives, you can safely add up to a gallon of 6% bleach each day until your kit arrives. If your CYA were to turn out to be about 35, use the 40 ppm CYA values for SLAM. Round up, always.

    Please add the details of your pool to your forum signature so it's easier to help you later.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
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    Mod Squad pooldv's Avatar
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    Re: Chlorine reading zero

    Here is what we are looking for in your sig.
    Pool School - Read This BEFORE You Post
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    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: Chlorine reading zero

    Sig test
    10,000 gallon AG vinyl pool, Hayward Aquarite t-15 SWG, Tristar VS pump, C3030 cartridge filter. Opened May 2015. K-2006

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    Scuba_Steve's Avatar
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    Re: Chlorine reading zero

    Add K-2006 to your sig after you get it in. Otherwise people will ask you every time you post.
    6425g Intex Ultraframe 18'x48" AG
    Stock 1500gph cartridge filter / Intex SWG CG-28669 with E.C.O.
    Install date: 5/26/2015
    TF-100
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    Mod Squad pooldv's Avatar
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    Re: Chlorine reading zero

    Quote Originally Posted by CNilsson View Post
    I am sure this is a dumb question, but since I have a SWG and my CYA level is 35, what would be my shock level since its not on the chart? Do I just add liquid bleach until I get a higher FC reading, with my generator off?

    I like to think I am an intelligent person, but I am sure having a hard time with this.
    Nope, not a dumb question. Use the shock level in the non-swg part of the chart. Also, notice that shock level is the same in both sections, salt or not.
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: Chlorine reading zero

    I got my kit!

    FC-2. CC-.6. CYA 33. TA 130? pH. 7.0

    Should I start the slam process to bring down my CC and then lower my TA and raise my pH?
    10,000 gallon AG vinyl pool, Hayward Aquarite t-15 SWG, Tristar VS pump, C3030 cartridge filter. Opened May 2015. K-2006

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    Scuba_Steve's Avatar
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    Re: Chlorine reading zero

    TA should be that last thing on your mind right now.

    Dont guesstimate on your CYA level. If it is in between 30 and 40, then use 40 as your CYA level.

    If you want, raise your pH up to 7.2 as per the SLAM directions. Your pH test will be useless during your SLAM because high FC messes with the results. Personally, I see no reason to raise it. I think this direction is more for people with high pH to get them to bring it back down.

    BTW, you are using the 25ml method of testing FC I assume? This level of accuracy is not needed, especially during the SLAM. You will just be wasting reagents. Use the 10ml method.

    Other than that, congrats on getting your kit! You are good to get SLAMing!
    6425g Intex Ultraframe 18'x48" AG
    Stock 1500gph cartridge filter / Intex SWG CG-28669 with E.C.O.
    Install date: 5/26/2015
    TF-100
    Helpful Links

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    aussieta's Avatar
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    Re: Chlorine reading zero

    add enough bleach per poolmath to bring you to 16ppm (259 ounce)
    repeat as often as possible
    every 2 hours is great, minimum twice per day
    when fc drops quickly you need to adjust more often
    SWG inground peanut shaped eco-bright concrete pool
    50,000 litres 13,000 gallons
    Lincoln Salt Chlorinator, 25 gram cell Sand Filter with glass media
    Taylor K2006-C test kit, Taylor K-1766 salt test, Dolphin M500 pool cleaner
    are you taking care of your pool or is the poolshop taking care of you

  16. Back To Top    #16

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    Re: Chlorine reading zero

    I have checking and adding bleach every three hours. It has dropped the last two times to 11.5 FC and the CC to .5 (last time might be less than .5 since the water barely changed with the 10 ml). Water looks clearer already. Should I keep adding or leave the pump running over night and see how much my levels drop? Should I leave my SWG off or turn it back on. And what is a normal pump run time and % level now that it is in the 90s daily?


    Thanks again for all your help. It was very overwhelming but I am hopeful I will get it eventually.
    10,000 gallon AG vinyl pool, Hayward Aquarite t-15 SWG, Tristar VS pump, C3030 cartridge filter. Opened May 2015. K-2006

  17. Back To Top    #17
    Scuba_Steve's Avatar
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    Re: Chlorine reading zero

    I would keep adding as often as you can until your water is crystal clear. Then perform the OCLT. SWG should be off until the SLAM is complete. Pump should be running 24/7.
    6425g Intex Ultraframe 18'x48" AG
    Stock 1500gph cartridge filter / Intex SWG CG-28669 with E.C.O.
    Install date: 5/26/2015
    TF-100
    Helpful Links

  18. Back To Top    #18
    aussieta's Avatar
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    Re: Chlorine reading zero

    16 down to 11 fc is still a big drop,
    you are still looking at a few more days
    if you end early, you will get another bloom soon
    when you get to 4 -5 fc drop over the whole day then you can do the overnight test
    SWG inground peanut shaped eco-bright concrete pool
    50,000 litres 13,000 gallons
    Lincoln Salt Chlorinator, 25 gram cell Sand Filter with glass media
    Taylor K2006-C test kit, Taylor K-1766 salt test, Dolphin M500 pool cleaner
    are you taking care of your pool or is the poolshop taking care of you

  19. Back To Top    #19

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    Re: Chlorine reading zero

    Stick with it all the way to the end. You'll be glad you did!
    26,000 IG, pebble tec, flagstone, pentair Triton II TR100 sand filter & VS+SVRS 3hp multi-speed pump, Intellichlor IC-40 SWG, Pentair Booster Cleaner, spillover spa, waterfall, Taylor K-2006 testkit
    [It is better to know how to learn, than to know. - Dr. Seuss[/I]

  20. Back To Top    #20

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    Balancing my numbers

    I'm back again! I left for a week on our family vacation and now I need to balance my numbers . I have the chlorine down but I just want to make sure I'm going about the other problems in the right order

    FC 4
    CC 0
    TA 125
    pH 7.7 (7.8)
    cYA 20 (could be lower, I couldn't add any more water)

    So I add stabilizer ( any specific brand?) , then use acid to lower pH down to 7.2 and aerate back up to lower TA?

    Thank you!
    10,000 gallon AG vinyl pool, Hayward Aquarite t-15 SWG, Tristar VS pump, C3030 cartridge filter. Opened May 2015. K-2006

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