Sounds like it is dying, very similar to what mine did. Interestingly mine had steel refrigerant lines and they got moisture buildup, rusting a pinhole through the line.
There are motion activated sprinklers available. Also a DIY project as I have seen some builds online. I had some pesky teenagers next door I was thinking about using it on.
I use one of those as a fermenter. I put a 2" tri clover cap on it with a hole drilled for an airlock. I have another blank cap I will eventually modify for perssurized transfer.
There is a forum trouble free pool.com that covers everything g you ever wanted to know about pool maintenance. I used liquid bleach and pool acid, and that was all my pool ever needed.