We have had our pool for 7 years and I've never had any problems with mice. Tonight I found our third mouse this year. The first one was on the bottom of the pool and the last two were in the skimmer. The only thing different this year, is the use of Boric Acid and the fact that I've left the retractable pool cover off almost the entire year/summer. It has been a very wet year as well. I'm just scared we are going to open the pool next year (We are having it closed this week) and find 50 dead mice in the bottom of the pool. Can anyone shed light on this? Also, I've been reading some posts that make me worried I should have been SLAMING the pool after finding mice. HELP!