Can evaporation occur with autocover closed?

mmesqc1578

Well-known member
Jul 3, 2020
109
Chicago, IL
Pool Size
26000
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
If keep autocover closed at night, can evaporation still occur? Lost about 1/8 inch in 18 hours. 3 of the hours the cover was open. Water is kept warm 80 degrees and night temps here are in 50s.
 

Mike1162

Silver Supporter
Jun 13, 2015
1,106
N Tonawanda, NY
How'd to happen to notice just 1/8 inch? I'm sure you wouldn't lose it through a closed cover. With that difference in temps you'd get a lot of condensation on the bottom of the cover. Some of that condensation would roll up with the cover but probably 1/64" or less.
 
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JoyfulNoise

TFP Expert
Platinum Supporter
May 23, 2015
21,087
Tucson, AZ
Pool Size
16000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
That's a huge temperature differential. There is a very large driving force for evaporative loss. Any exposed pool water will want to evaporate at that temp. 1/8" is really small so I'm not too surprised
 
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mmesqc1578

Well-known member
Jul 3, 2020
109
Chicago, IL
Pool Size
26000
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
How'd to happen to notice just 1/8 inch? I'm sure you wouldn't lose it through a closed cover. With that difference in temps you'd get a lot of condensation on the bottom of the cover. Some of that condensation would roll up with the cover but probably 1/64" or less.
I marked water level with piece of tape at skimmer.
 
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