How much water will leak to evaporation on inground 18x36?

Thanks Gordiec... I see you are from Huntsville. I work in Huntsville.

My leak is weird. I dont have air problems when the pump is running, which I think I should if I have a break in the piping somewhere. Its just that I have more of a leak when the pump is on than off. I just wondered if you lost more water to evaporation when the pump is running versus when it is turned off.
 
Since your leak is worse when the pump is on but you're not getting any air in the system your leak is on the discharge side of the pump. Check your waste line on your multiport when the pump is running to make sure it's not discharging water when it's not supposed to be. There have been several issues of that happening lately.
 
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