I realize having a system that auto fills the pool as needed can keep you from noticing a leak, but I need to come up with something because I'm out of town most of the time and can't depend on someone else to sit there for 1-2 hrs/week adding water to my pool during the summer. What is the best way to accomplish this, is there a system I can buy or DIY something that will notice when water needs to be added then it opens a valve or something along those lines?