Evaporation

[Rangeball]

I had always thought hot weather was the leading cause of evaporation. The past several nights we've gotten down into the low 60's and even upper 50's with unseasonably cool daytime temps. I was holding a steady water level for weeks, but I've lost about 2" of water since then.

I assume evaporation loss has no impact on some water tests but does on others, like CYA (same CYA content but less water so it increases?)?

I also assume a 2" loss isn't worth worrying about as far as testing goes, especially since I plan to add it back soon?

[JohnT]

No, it isn't significant as far as testing, but you need to be careful of your skimmer(s). Once the water drops so far they can outsuck the inflow and cause the pump to lose prime.

[Rangeball]

That's what I've been keeping an eye on

I was just suprised at how much quicker evaporation seemed to be with cold weather than warm.

[cleancloths]

Has it been windy? I would likely attribute the higher evaporation to windage than temperature.

[mas985]

Evaporation depends on humidity, temperature and wind speed. A warm pool with a cool low humidity night is one of the best conditions for evaporation and you will tend to lose more water at night than during the day.

Useful site:

http://www.grow.arizona.edu/Grow--Gr...ResourceId=208