When we got our cats last summer, they gave the pool a very wide berth. They wouldn't get within two feet of it. But we covered it for the winter and they liked running across the cover and playing on it. Eventually they couldn't do that as much because rainwater raised the water level in the pool and there were puddles all over it, but they still crossed around the edges. Now, we've taken the pool cover off, and I was hoping they would avoid it but they're getting right up to the edge to drink the water. Of course, the water right now is filthy so that's a concern, and also I'm afraid they'll fall in and drown. I'm not worried about the pool once we clean it though, because it's a saltwater pool. But I'm still worried about them falling in and drowning. They're about a year old, but I don't know if they can swim on instinct or not. We also have a pool cleaning bot, so even if they could swim I still worry about them getting tangled in its hose. What should I do?