I usually try to keep my water level at the upper middle of the skimmer, the installer pointed out using the the 3rd screw up as a reference guide, it seems to keep the pump happy, and makes vacuuming easier without sucking in too much air hooking up the vac hose and causing the pump to lose prime. However, it seems that it never stays at this level for long, and I end up topping off the water level about once a week or so, and adding about an inch to an 1 1/2. I don;t beleive I have a leak, but probably just normal evaporation, splash out, etc.

Wondering how often every else one tops off?