Water filtering question

So work is slow and I'm sitting here thinking about ways to make my fish room nicer and less work. So I thought about improving my water change system but wanted to bounce the idea off some of you guys/gals.

So my local tap water has Chlorine in it and I use prime to remove that. I have seen other people set up automatic water changing but with the chlorine I can't just set up a automatic water change system because I would have to remove the chlorine first. Would something like this work to make the water safe for the tanks? http://www.amazon.com/Camco-40631-P...id=1427918455&sr=8-7&keywords=chlorine+filter The filter should remove anything harmful to the fish but I have read that the fish and plants need some of the minerals to be left in the water. I have also read that RO water isn't good for fish because it lacks those things they need. ( I know the filter is not a RO system)

I think I could sale my wife on the idea of adding one to our house and just tap in for the tanks. Saving me a bottle of prime every month would be a nice benefit also.

How many drops a sec would be a good starting point and still be safe? From what I have been able to work out a drip system with something like 3-4 drops a sec is about 4 gallons a day. So that wouldn't be enough water to hurt the bio? I would assume the tank size will play a part in that also. In a 20g 4 gallons is a 20% every day but in a 125g 4 gallon only a 3% change every day. That 4 gallons might not hurt the 125 but would be a lot in the 20g.

Not trying to argue the point just want to make sure I understand.

I found a article here on the site that shows taking a 55g barrel allowing it to fill up and "Age" the water while you pump that water into your drip system. That way I'm not putting chlorine into my tanks but it would require more work to set up. I'm not against the work just want to make sure I don't have to redo the system as my fish room grows.