I'm in the process of researching some Automatic Top Off systems (ATO's) and was wondering if any of you had opinions on them. Right now I've narrowed it down to the JBJ simply because, at $80, its the cheapest. Any of you know what type of pump I would need to get for it? I have a spare 500gallon/hr pump in the basement but I think that would be way too much pump for an ATO. Any words of wisdom on the issue?