Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 4 of 4

Thread: Reducing Chlorine

  1. Back To Top    #1

    Join Date
    Aug 2008
    Location
    Honolulu
    Posts
    429

    Reducing Chlorine

    Not wishing to flog a dead horse with my last post "I just did an iron treatment" and moving on I have the following seemingly simple question.

    Yesterday evening my FC was at 22, this morning it has only fallen to 20. I would like to open it to swimming this evening. Normally after even high levels of shocking with liquid chlorine it will drop quickly back to just above normal levels in this case FC 4, with a CYA of 30. I think using Chem Geek's analogy of "Soldiers and Reserves" I have killed all the enemy and am now in a state where I will not use the front line troops (at least not very often), nor at present use the reserves, in this case held by my CYA.

    The question then is would it be allright if I dropped my FC using Thio-Trine/Sodium Thiosulphate to say FC 6 to start swimming again? My guess is it would be but I want to make sure and if it is how long would you recommend I wait after the treatment?

    This will be hopefully my last post for a while.

    Thank you to those that help.
    10,000 gal plaster pool,3/4 hp WhisperFlo pump, Sta-Rite Great White GW9500 pool cleaner, Hayward 300 lb Sand Filter
    Use Magenta Stuff for Iron and Silica control.
    Balance: pH 7.7 Cl 7 -8 Alk 70-80 CH 325 CyA 30 in winter - 50 in summer NaCl 1010 TDS 1200

  2. Back To Top    #2
    dmanb2b's Avatar
    Join Date
    Apr 2009
    Location
    NY
    Posts
    3,728

    Re: Reducing Chlorine

    with a CYA of 30...all you need is an FC of around 12ppm to be considered safe to swim in. Buit you can use a chlorine neutralizer to bring it down quicker if needed.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

    Pool School, TFTestKits, Pool Calculator

  3. Back To Top    #3
    Melt In The Sun's Avatar
    Join Date
    Oct 2009
    Location
    Tucson, AZ
    Posts
    3,899

    Re: Reducing Chlorine

    It's fine to use (it will raise your pH a little, FYI).
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

  4. Back To Top    #4

    Join Date
    Aug 2008
    Location
    Honolulu
    Posts
    429

    Re: Reducing Chlorine

    Thank you both for the quick replies.

    Hopefully by this evening it will have dropped closer to, at or below 12; unfortunately it is not a very sunny day but things change quickly here. pH change is Ok as it is currently 7.2 and the target is 7.4.

    Aloha.
    10,000 gal plaster pool,3/4 hp WhisperFlo pump, Sta-Rite Great White GW9500 pool cleaner, Hayward 300 lb Sand Filter
    Use Magenta Stuff for Iron and Silica control.
    Balance: pH 7.7 Cl 7 -8 Alk 70-80 CH 325 CyA 30 in winter - 50 in summer NaCl 1010 TDS 1200

Posting Permissions

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