Turtle pond?

[jrp1588]

I've been toying with the idea of putting in a small pond for my red eared slider. It would just be a small 100gal preformed pond like this one. I've never done anything involving ponds though, so I'm clueless. Do I have to filter the water? If so, how do I filter it? What would be a good basking area for him? I suppose I could try to find a log or something big enough. What would be a good way to keep him from escaping? I'm thinking a short wall of landscaping bricks or something. I'm assuming I'd need to bring him in for the winters. I've read they can hibernate underwater somehow as long as it doesn't freeze solid, but I think that volume of water would probably freeze