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

Thread: normal chlorine demand?

  1. Back To Top    #1

    Join Date
    Oct 2009
    Location
    Southern CA
    Posts
    54

    normal chlorine demand?

    Chlorine demand of the pool has been going up. FC has been decreasing by 1.5-2ppm per day. I thought duck feces in the pool had something to do with it. However, no feces today, but still lost 2ppm FC. has been using 6% bleach, just switched to 10% liquid chlorine. FC level has not been going up accordingly. overnight chlorine loss is zero, CC is zero.

    pH 7.6
    FC 6.5 at 5pm (8.5 before direct sun shine on pool this am)
    CC 0
    TA 90
    CH 360
    CYA 40
    temp 78F approx

    1. what is the "average" chlorine demand per day in southern CA (sunny, mid 70F weather)
    2. CYA was 60 in the fall. had tremendous rain in the winter. Is 40 a reasonable number due to dilution?
    3. if there is no o/n chlorine loss, CC zero, why is the amount of bleach not bringing up FC level adequately according to the calculator? shelf life of bleach too old?

    Thank you.
    Irregularly shaped IG pool with aggregates of squares and rectangles, spa overflows to pool
    21K gallon, Pebble tec, 450 sq ft, 125 GPM cartridge filter, 1hp pump, 1.5hp booster pump, Jandy heater,
    2 skimmers, 2 main drains, Hayward Navigator automatic vacuum connected to one of the skimmers

  2. Back To Top    #2

    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    28,395

    Re: normal chlorine demand?

    Irvine,

    I'd say your consumption is just about right. If you've noticed a trend upward recently, I would think it is due to the warming of your water temp. Answering your questions.....

    1. On this forum, 2ppm seems about average for an outsdoor pool

    2. Absolutely reasonable....splashout may have contributed as well.

    3. Not sure I understand the question, but very old bleach (say, from last year) will be weakened.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,963

    Re: normal chlorine demand?

    Ditto, what Dave said...
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  4. Back To Top    #4
    poolgirl22's Avatar
    Join Date
    Apr 2010
    Location
    Stephens City, VA
    Posts
    595

    Re: normal chlorine demand?

    I am losing between 1.5 and 3 a day, holding at night, and I live in S. Indiana!!! So your daytime loss seems great to me! lol!
    I get sun from 9am to 6pm so...
    Backyard pool-less, but used to be.....
    16,100 gallon, 18x38 3.5 ft deep oval AG, Vinyl, Sand, 1hp pump
    http://www.poolservicestech.com Liquidator
    http://www.poolcalculator.com/
    http://www.tftestkits.net TFT100 test kit

  5. Back To Top    #5

    Join Date
    Oct 2009
    Location
    Southern CA
    Posts
    54

    Re: normal chlorine demand?

    Thanks! i feel better now.
    Irregularly shaped IG pool with aggregates of squares and rectangles, spa overflows to pool
    21K gallon, Pebble tec, 450 sq ft, 125 GPM cartridge filter, 1hp pump, 1.5hp booster pump, Jandy heater,
    2 skimmers, 2 main drains, Hayward Navigator automatic vacuum connected to one of the skimmers

Posting Permissions

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