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

Thread: FC in Winter

  1. Back To Top    #1

    FC in Winter

    This is my first "winter" in Georgia with a pool. I am planning on keeping the pool open - I have a freeze protection thermostat on my pump so it automatically comes on when the air temp goes below 38 degrees. I have a question regarding chlorine levels: My pool water is down to 55 degrees. I am not covering the pool. Do I still need to keep the FC level at 3ppm (recommended all the time? I have read that algae cannot start in water below 60 degrees, and if that's the case can't I just start adding bleach in the Spring when the water temp starts coming back up?

  2. Back To Top    #2

    Join Date
    Jul 2011
    Central Califorina

    Re: FC in Winter

    Below 60 algae is slowed but will grow. FC consumption will drop dramatically. You can probably get by adding chlorine once a week or so. The other option is to let it go to the algae and deal with it in the spring.
    3500 gallon 14x42 Intex Ultra Frame
    1/2 HP Intex 1600 sand filter/pump - Intex SWCG
    Two 4x20 Fafco solar panels.
    Taylor K-2006
    Marquis spirit hot tub - Grill Dome ceramic grill/smoker

  3. Back To Top    #3

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: FC in Winter

    While algae growth rates slow down, so does the chlorine killing/oxidizing rate. You need to maintain roughly the same FC/CYA ratio as you normally would, but it is true that algae growth is quite slow when the water is colder. When my pool water gets to the 50-55ºF range, I only need to add chlorine once every week or two. That's with a pool cover. If your pool is exposed to sunlight, you can still have chlorine loss from that since it's independent of temperature, but usually in the winter there are more days with less sun and the sun is lower in the sky so less intense.
    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