I use a Loop-Loc safety pool cover. It is a sieve type cover and everything goes through it all winter. Last winter was unusually warm and the water never froze here which is very unusual and I think that was a factor. No solar blanket. I used to use a floating solar blanket but it just let everything fall into the water when I rolled it u pinto it's reel.Do you use a winter cover and/or a solar cover? I'm in farm country and the pool is surrounded by trees and landscaping. I used to open late to avoid the farmers ploughing and spraying the fields. Then I'd switch to a solar cover to help keep stuff out. Now that I have an auto cover I can open earlier and now worry about it.