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

Thread: low free chlorine

  1. Back To Top    #1
    aussieta's Avatar
    Join Date
    Jan 2014
    Location
    Langwarrin, Victoria, Australia
    Posts
    419

    low free chlorine

    is it possible for the chlorinator to show an output but not actually be working?
    have a lincoln SWG, shows around 68% fluctuating with air bubbles
    last thing before FC drop was add 4kg balpak 300 (calcium) hardness was 120 increase to 170
    FC dropped to 1.6ppm, 0ppm CC, from a steady 3.6ppm FC and got a tiny amount of algae over a two week period
    added cal/hypo as have low calcium 170ppm
    after a couple of days holding FC at 18ppm, water was spotless and algae gone
    stopped using cal/hypo and FC dropped to 8ppm in two days

    10 january added 4kg calcium after test
    TA 90, ph 7.4, hardness 120, FC 3.6, CC 0, cya 70

    24 january found low FC
    TA 90, ph 7.4, hardness 170, FC 1.6, CC 0, cya 70

    25,26,27 january during cal/hypo use
    TA 90, PH 7.5, hardness 180 FC 18, CC 0, cya70

    this test 29 january, stopped using cal/hypo on 27 january,
    TA 90, PH 7.5, hardness 180 FC 8, CC 0, cya 70
    added more cal/hypo after test just in case chlorinator is faulty

    i realise an overnight chlorine loss test would help but i don't live at the property
    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

  2. Back To Top    #2
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: low free chlorine

    You could say that's a 5 PPM FC loss each day. Considering it is hot summer there, I wouldn't say this is too bad.

    Has anyone been using the pool on those days at all?

    It sounds like you have a good understanding of things and yes an OCLT would be a good idea if you can arrange it.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

  3. Back To Top    #3
    aussieta's Avatar
    Join Date
    Jan 2014
    Location
    Langwarrin, Victoria, Australia
    Posts
    419

    Re: low free chlorine

    that was with chlorinator running which made me expect virtually no loss
    pool is geting heavy use atm
    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

  4. Back To Top    #4
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: low free chlorine

    Yo should always expect loss on a daily basis, especially with heavy, or even moderate use. Still doesn't sound bad to me at all.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

  5. Back To Top    #5
    aussieta's Avatar
    Join Date
    Jan 2014
    Location
    Langwarrin, Victoria, Australia
    Posts
    419

    Re: low free chlorine

    performed overnight chlorine loss
    9pm 13.5FC
    6am 13.5FC
    so that was a nice surprise

    local pool shop suggested a few things to see if chlorinator is working
    if cell is in a clear housing look for bubbles/cloudy water coming out of cell
    measure FC in pool and directly from return jet to see difference

    measured tonight 4pm
    in deep end 10FC
    from return jet 11.5FC
    so appears SWG is working just not sure how efficiently
    have added another 3 hours to pump run time and increased output to 90%
    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

Posting Permissions

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