I'm in San Diego. Water evaporation is expensive. My water bill last year was $750 for 2 months

I think I've cut it in half by doing bubble covers but they are not easy to go on and off.

I want a slatted cover, but can't find it in the US. Anyone know of a dealer in the US?

https://img.waimaoniu.net/1492/1492-...1429045954.jpg