How much water lost in a closed pool with auto cover

wangpeng

New member
Oct 20, 2018
4
Richland/WA
I have a fiber glass pool with auto over. It is closed for winter and I noticed that the water level drops about 1/4 inch (maybe less ) in one or two weeks. Is this a normal rate of evaporation or somewhere is leaking water?
 

HiddenRiver

Gold Supporter
Bronze Supporter
Jun 15, 2017
323
East Coventry, PA
Re: How much water lost in a closed pool with water cover

I have a fiber glass pool with auto over. It is closed for winter and I noticed that the water level drops about 1/4 inch (maybe less ) in one or two weeks. Is this a normal rate of evaporation or somewhere is leaking water?
I think 1/4 inch in 1-2 weeks would be about right in our area of S.E. Pennsylvania, maybe more. Is the auto cover airtight/plastic or mesh and loosely sealing the pool?
 

wangpeng

New member
Oct 20, 2018
4
Richland/WA
Re: How much water lost in a closed pool with water cover

I live in south east Washington state. The cover is not air tight. I think there is some water loss but I am not sure how fast is normal. I have a aquamatic EZ cover. It is loosely floating on top of the water with tracks on both side. One end is touching the pool wall and the other end is the cover box where the cover can be retracted back.
 

Catanzaro

Platinum Supporter
TFP Guide
Jul 30, 2014
3,327
Monmouth County, New Jersey
Re: How much water lost in a closed pool with water cover

You will have evaporation during the winter. Keep an eye on things. More than 1/4" weekly could be excessive. Evaporation, however will stop when the water freezes on the surface.

You can also perform a bucket test, just do not add water and cover if rain occurs, and you will see that there will be some evaporation. No where near the summer months, but some. Thanks!
 

JohnT

Admin
Mod Squad
TFP Expert
Apr 4, 2007
9,589
SW Indiana
Re: How much water lost in a closed pool with water cover

It depends on climate. I gain water from rain all winter and usually have to drain once or twice.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
22,038
Laughlin, NV
Re: How much water lost in a closed pool with water cover

Southeast Washington is desert. That amount of evaporation is fully expected.