Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 7 of 7

Thread: Can I partially cover my pool?

  1. Back To Top    #1
    joshearl's Avatar
    Join Date
    Apr 2011
    Location
    Northern California
    Posts
    61

    Can I partially cover my pool?

    I've become interested in a high mil cover mostly for a boost in temperature. My pool is shaped rectangular 14'x39' but it is irregular, sort of a staggered width. This makes it 12' wide in a few sections. I've been thinking about buying a 12'x'20/24 cover and just covering the deep end. I figured this would actually be convenient as I could still lounge in the shallow area while it is in the pool. This would be ok right? Would it be covering enough area to raise the temperature? I get a lot of sun as it is but extending the season is enticing!

    Here is a picture of my pool when it was green so you can see what I mean about the staggered width.
    25,000gal Plaster
    Pentair Nautilus NS-60 DE Filter

  2. Back To Top    #2

    Re: Can I partially cover my pool?

    Partially covering might warm it a bit but it wont help with the evaporation at night. Why not get two covers? Both oversized and just cut to fit, that way you can keep one on and one off. I don't recommend that though as that can be a potential drowning hazard.

    I did that with my solar cover since I have a slight jog on one side and a straight line on the other.
    13,100 gal (?) IG Plaster Pool, Rectangular (30 feet long, 11 feet wide at 3 feet deep shallow end, 14 feet wide at 6 feet deep end.)
    Pentair Challenger 1hp 2 speed hardwired pump
    Triton II T60 sand filter
    P153 Intermatic digital timer control
    8 gal Liquidator with 3/8" upgrade

  3. Back To Top    #3

    Join Date
    May 2010
    Location
    Ottawa, ON, Canada
    Posts
    153

    Re: Can I partially cover my pool?

    A cover won't raise temperature, it will simply make it drop less. I'd get a 12 x 40 with a roller and start rolling in the deep end.
    19.5k gallons in ground, P4 panel with turbocell SWG, 1hp Hayward superpump II, sand filter, Heater low nox 250k btu heater, solar cover on rocky roller

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

    Re: Can I partially cover my pool?

    Getting a partial cover will help, though obviously not as much as complete cover. There is a safety risk with swimming while a cover, even a partial cover is on. You could get entangled in the cover if you accidentally wander over towards it.
    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
    joshearl's Avatar
    Join Date
    Apr 2011
    Location
    Northern California
    Posts
    61

    Re: Can I partially cover my pool?

    I can't afford to cover the entire pool at the moment but i didn't want to waste my money on partially covering if it won't make a difference. As far as the safety hazard, there would still be about a 1' of open water against the edge on each of the other three sides, though I'm not planning on swimming while it's on. At this point though it seems like maybe I should wait and get two sections to cover the entire surface.
    25,000gal Plaster
    Pentair Nautilus NS-60 DE Filter

  6. Back To Top    #6

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

    Re: Can I partially cover my pool?

    Quote Originally Posted by Big Thunder
    Partially covering might warm it a bit but it wont help with the evaporation at night.
    I don't believe that this is true. If you cover half of the water, then evaporation should be cut in half since the surface area between water and air is cut in half. So the heat loss from evaporation should be cut in half.

    If the cover is partly/mostly opaque, then this will also cut down the amount of heating of the pool from direct sunliight. If the cover is clear, then you get some heating from the sun, but also the associated chlorine loss from its breakdown in UV from sunlight.
    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"

  7. Back To Top    #7

    Re: Can I partially cover my pool?

    [quote=chem geek]
    Quote Originally Posted by "Big Thunder":2p9s3ya2
    Partially covering might warm it a bit but it wont help with the evaporation at night.
    I don't believe that this is true. If you cover half of the water, then evaporation should be cut in half since the surface area between water and air is cut in half. So the heat loss from evaporation should be cut in half.

    If the cover is partly/mostly opaque, then this will also cut down the amount of heating of the pool from direct sunliight. If the cover is clear, then you get some heating from the sun, but also the associated chlorine loss from its breakdown in UV from sunlight.[/quote:2p9s3ya2]


    Very true. Wasn't thinking of the big picture.
    13,100 gal (?) IG Plaster Pool, Rectangular (30 feet long, 11 feet wide at 3 feet deep shallow end, 14 feet wide at 6 feet deep end.)
    Pentair Challenger 1hp 2 speed hardwired pump
    Triton II T60 sand filter
    P153 Intermatic digital timer control
    8 gal Liquidator with 3/8" upgrade

Posting Permissions

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