What temp to use for calculating CSI ?

[saraiks]

There is a lot of variation in the day and night temperatures expected here in NorCal for this weekend. It is supposed to be at 75+ during the day and 50+ for the night. This is a 25 degree variation which produces two widely varying numbers for the CSI in the pool calculator. What number should be used to balance the pool ?

 

[JasonLion]

You want to use the water temperature, which won't vary nearly as much as the air temperature. If you have both day and night water temperatures then average them.

 

[saraiks]

Thanks Jason..