I'm curious to hear how much (little) evap you get with a good fitting cover. Mine has about a 3" gap at one end when closed, all 3 other sides covered. and yet we still lose about 1.5" per month in the summer. In the cooler months a bit less. I expected it to be near zero. We've had a leak detector service out, and they didn't think it was unusual. When we fix our stuck cover, we'll test using the skimmer wells.
Evap rate with cover on
- Thread starter Aztec
- Start date
I have an auto-filler, so haven't thought much about this, but a non-pool related water problem caused me to shut that off. I have about 10 sq. feet uncovered (if my calculations are correct), and lost substantially more than you did, maybe an inch/week in the summer. We've had rain up here, so we went high, and now are losing a bit.... I'm going to do a more formal test when we have a predicted 7-10 days without rain, but I would be less nervous with your evap. rate than I am with mine.
Normal evaporation loss is 1/8"-1/4" per day without a cover. I don't know what normal is with a cover besides much less. The best way to check is a bucket test. More here about that, Pool School - Leak Detection
- May 3, 2007
- 16,901
- Pool Size
- 20000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
Evaporation should be proportional to the area of the water coverage. So if the cover covers 95% of the water area, then you should have only 5% of the evaporation you have without the cover.
But the amount you are seeing could be due to splash out unless you never use the pool.
But the amount you are seeing could be due to splash out unless you never use the pool.
Here in north Florida, my pool water evaporates more in cooler temps. I'm guessing it's due to much lower humidity levels than summer heat, when humidity hangs around 85-95% most of the time.