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

Thread: Rate of chlorine loss in a covered pool verses an uncovered pool

  1. Back To Top    #1

    Join Date
    May 2015
    Location
    minneapolis minnesota
    Posts
    9

    Rate of chlorine loss in a covered pool verses an uncovered pool

    I know there is a difference, but can anyone quantify it for me? It seems like when I cover the pool the chlorine lasts a lot longer.

    Thanks in advance
    30,000 gallon in-ground; cartridge filter; Hayward Super Pump; vinyl liner

  2. Back To Top    #2
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,982

    Re: Rate of chlorine loss in a covered pool verses an uncovered pool

    Here was a previous discussion on that topic: What effect does having a cover have?
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  3. Back To Top    #3

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: Rate of chlorine loss in a covered pool verses an uncovered pool

    The answer is temperature dependent because while the loss from sunlight depends only on the amount of sunlight (at a given FC and CYA level), the losses other than from sunlight are a function of temperature. For example, in my warm pool at 88F with a mostly opaque pool cover, if it's on all the time the loss is around 0.7 ppm FC. Without a cover the loss would be roughly 2 ppm FC. However, if I had a lower water temperature the loss might be less than 0.7 ppm FC so an even bigger difference.

    Ironically, the chlorine losses other than from sunlight are mostly chlorine oxidizing the cover, assuming you have a clean pool and filter. There is also some lost from outgassing when the cover is off, but not that much.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

Posting Permissions

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