Folks I know...in global regions where where the daytime temps can run over 45C and the nights drop to a balmy 38C .... cover their swimming pools with a high strung double triangle tarp on guy-wires.

The cables and toggle bolts last for years...the tarps are rotated and they are good for two years.

It keeps the swimming pools down to 28C
Nice geometric artistic designs.

Sincerely,

Gargoyle



evaporation can still run one inch a day ... watch out for salinity.