I like the slow TC release idea and adding bleach. That way I don't use so much liquid. I estimated the pool to be around 10,000 gallons by measuring the sides and depths at certain points. Wasn't too straight forward becasue the pool is a funny shape. Here is an attached drawing:

http://i253.photobucket.com/albums/h...Dimensions.png

The depths are in the middle of those sections and I should also note that it gets around 6' deep around the drain.

I have a 36 sqaure foot DE filter that I just replaced the screens in a couple weeks ago and added DE to. I'll have to backwash eventually it but I don't know how often yet as I just started taking care of it. I can't imagine it needing to be backwashed very often because the pool is screened in. Figure I'll do it every few months and just watch the pressure

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Thank you everyone for the help!