Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 3 of 3

Thread: Chlorine demand change

  1. Back To Top    #1
    H-12 1/2 Mike's Avatar
    Join Date
    Apr 2014
    Location
    Highland Village, TX
    Posts
    74

    Chlorine demand change

    Over the last week I have noticed a drastic change in my chlorine daily demand from 32oz of 8.75% to 97oz per day. The CYA has been a constant 50ppm. I have been checking and recording daily for the past three years and have no record of this drastic change occuring before. The water temp has dropped only 3 degrees in the last week. I have cleaned my cartridge filters in the last week. I have increased my pump rpm from 1500 to 2000 in the last week. My pump runs 24/7 and has for several years. One other change has been that the waterfall is now running 24/7.
    Any ideas?

    16,400 gallon
    Cartridge Filter
    IG
    Plaster
    Intelli-Flo @ 2000rpm

  2. Back To Top    #2

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    29,898

    Re: Chlorine demand change

    Chlorine is lost from your pool either by UV from the sun or living organics in your pool........nothing else.

    Since your UV loss is stable and actually decreasing a bit as the sun gets lower, the inescapable conclusion is you have invisible algae and need to SLAM your pool.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3
    H-12 1/2 Mike's Avatar
    Join Date
    Apr 2014
    Location
    Highland Village, TX
    Posts
    74

    Re: Chlorine demand change

    Thanks for the information. I will slam after a couple of days of monitoring to see if it will stabilize. The water is perfectly clear and we do have a lot of leaf drop at the present.

    16,400 gallon
    Cartridge Filter
    IG
    Plaster
    Intelli-Flo @ 2000rpm

Posting Permissions

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