Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 5 of 5

Thread: Lbs of Chlorine from SWG to Bleach comparison

  1. Back To Top    #1

    Join Date
    Sep 2007
    Gloucester County, NJ

    Lbs of Chlorine from SWG to Bleach comparison

    I'm trying to figure out how long I need to run my pump and at what level I need to run my new Jandy AquaPure. I currently have my pump running 12 hours/day (2am - 5am; 12pm - 9pm) with my AquaPure at 80%. My basic numbers are FC 1.5; CC 0; PH 7.5 (constantly adding acid); Alk 80; CH 280; CYA 70.

    I appear to be having difficulty getting my FC to stay in the 3-4 range, as indicated by the PoolCalculator. Now, we are in a major heatwave here (100+ degrees today and many 92+ days) with 87+ degree water. I've been supplementing with Bleach to raise the levels, but I'm wondering if I just need to add more pump time....or is it just because it's so HOT (we also get direct sun from 10am - 8pm).

    The AquaPure is supposed to generate 1.25 pounds of chlorine per 24 hour period. I am running it at 80% for 12 hours (as previously mentioned). So, based on my rudimentary calculations, that translates to a 1/2 pound of chlorine per day. How much bleach (6%) does this translate to?
    28,000 gallon gunite/white plaster with 30ft RBB and 2ft sheer descent, 100 sq ft thermaledge, 50sq ft spa w/ 6 jets
    2HP Jandy pump, 60sq ft Jandy DE filter, 400,000 BTU Jandy LX Nat Gas Heater, 2 Jandy color lights + Jandy color spa light, Jandy Aqualink RS6, Jandy AquaPure 1400

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Lbs of Chlorine from SWG to Bleach comparison

    You can use the Pool Calculator to answer questions like this one, though it doesn't do it directly. In the FC section, you can set the type of chlorine to "chlorine gas" to get weights that correspond to the numbers reported by SWG spec sheets. Then you need to play with the current and target FC levels to get the weight of chlorine gas to where you want it, and then it will show you the equivalent amount of bleach.
    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
    New2Me's Avatar
    Join Date
    Jun 2008
    SW Indiana

    Re: Lbs of Chlorine from SWG to Bleach comparison

    Man I love that pool calculator!
    When I put in 28k for the pool size, 0 and 2.14 for the Now and Target FC, leave the bleach at 6% and select chlorine gas, it tells me that it takes 124 oz of 6% bleach, which equals 8.0 ounces of chlorine gas.
    So the answer to your question is 124 ounces of 6% bleach is what your 12 hour run at 80% power produces with a clean cell.
    You do know that you should always stay ABOVE the minimum recommended FC level of 3 (I would recommend a 5-6ppm target myself) for your 70 CYA, don't you? If it is dipping below that at any time, you are susceptible to algae, which will increase your chlorine demand. I would crank up the output to 100% immediately. Raising your CYA another 10-15 ppm will cut your chlorine UV losses, but before doing that I would do an overnight FC loss test to make sure that something other then UV is not eating your FC.
    I use borates to combat ph creep, and it has cut my acid usage quite a bit, plus, it acts as a mild algaecide, too.
    Good Luck, and Best Wishes!!
    22 x 40 IG vinyl lined, 23,570 gal.
    1 hp. Pac-Fab Challenger pump 300# sand filter
    Intex 8110 SWG, Hayward CL220 offline feeder
    Hayward 250K Btu gas heater

  4. Back To Top    #4

    Join Date
    Jul 2010
    St Charles, Il

    Re: Lbs of Chlorine from SWG to Bleach comparison

    Why would someone need bleach with a SWG system?
    Chris A.
    20x40 36k gal IG vinyl pool w/diving board & slide
    1HP Pentair Challenger motor & pump | 30" Triton TR100 sand filter | Stenner 45MHP2 Peristaltic Pump
    Hayward CL200 Tablet Chlorinator | Pentair SM-20-3 multiport | TF-100
    2003 Sundance 850 Altamar hot tub

  5. Back To Top    #5
    benavidescj's Avatar
    Join Date
    Apr 2010
    Fleming Island, FL

    Re: Lbs of Chlorine from SWG to Bleach comparison

    You don't really, he is just trying to figure out how long to run the SWG. He is converting SWG output to equivalent bleach so he can figure how long to run the SWG.
    Pool: 28,000 gallons IG; IC 40 SWG; Pentair 120 gpm cartridge filter; Marble finish; Pentair Wisperflow 1.5 hp; Polaris 360
    Spa: 350 gallon; Bromine
    How to shock your pool

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts