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

Thread: High Chlorine all of a sudden

  1. Back To Top    #1

    Join Date
    Aug 2008
    Location
    Phoenix, AZ
    Posts
    26

    High Chlorine all of a sudden

    My FC has been running right around 5 with my filter and SWG running for 8 hours per night at 40%. All of a sudden after this weekend my FC is at 10 and I can't get it down. I finally turned my SWG off and will leave it off until I get it down. Any idea why the chlorine level would rise with no other changes? Only thing I did this weekend is shock the pool with a non-chlorine shock (Fresh 'n Clear from Leslies) and add MA to lower the Ph from 7.8. Water looks great but you can smell chlorine when you walk into the backyard.

    FC 10
    CC 0
    CYA 65
    TA 90
    Ph 7.5
    CH 230
    Salt 2900


    Thanks for any help.
    15,000 gal Freeform Salt Water (SWG), Pebble Sheen with in floor cleaner. Hayward 1.5hp pump and 425sq ft Hayward Cartridge filter. 35sq ft Waterfall with separate 1.5hp Hayward Pump.

  2. Back To Top    #2
    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    Location
    SW Indiana
    Posts
    9,089

    Re: High Chlorine all of a sudden

    With the FC at 10 and 0 CC, it seems really odd to me that you can smell the chlorine. The only plausible explanation I can offer is that you had a lot of contaminants in the pool which were consuming chlorine. When you used the shock, you eliminated them, which allowed the chlorine level to rise. I'm still puzzled by the chlorine smell.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  3. Back To Top    #3
    no-mas's Avatar
    Join Date
    Jun 2008
    Location
    FL
    Posts
    405

    Re: High Chlorine all of a sudden

    I experienced something similar last year around this time - I didn't shock like you did, but found my FC at 8 from the usual 3, and could slightly smell it. I've never detected CCs in my pool and have never shocked. I attributed it to decreased usage and cooling temperatures. I decreased the %output and the pump run time, which seemed to work after about a week.

    The smell wasn't a nasty overwhelming odor - just a slight fresh scent of chlorine when I came close to the water, but that I had never noticed prior to or since. This year I've already decreased run time and SWG output, and have had neither the spike in chlorine nor the odor I detected last year.
    18k gal inground, everbrite finish, 505 sq ft; 1.5 hp two speed whisperflow; rheem 5100ti 100k btu heat pump; 3 sheer descent falls; DE filter; swg (cell out and using trichlor for now)

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: High Chlorine all of a sudden

    If the water temperature has been falling recently the pool would use less chlorine, which could result in a high than normal FC level.
    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

  5. Back To Top    #5

    Join Date
    Aug 2008
    Location
    Phoenix, AZ
    Posts
    26

    Re: High Chlorine all of a sudden

    Thanks guys...maybe it's the cooler weather and I need to reduce my chlorine % and run time. I'll give it a try and let you know.
    15,000 gal Freeform Salt Water (SWG), Pebble Sheen with in floor cleaner. Hayward 1.5hp pump and 425sq ft Hayward Cartridge filter. 35sq ft Waterfall with separate 1.5hp Hayward Pump.

Posting Permissions

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