So I've been thinking.... (God, I need to stop that..) Anyway, I spend a pretty large amount of time that I don't really have doing water changes and topping off my sump on my 150 gal. I've come up with an idea to utilize airline tubing, a float switch, a small pump, and a ball valve to adjust the speed of the drip. I'm thinking that I can tee off of a line my brother uses for his RODI system for his reef tank and send it to my sump at like 5 drips a second. That will be about 40 gallons worth of new water per week. I would have the float switch turn an aqualifter pump on that would pump water out of the sump when it reached a specific level and right outside. Would this work? it certainly could be done very cheaply by me and would save me so much time. I'd only have to clean filter socks,scrub algae, and vacuum my substrate every once in a while. My tank would also benefit greatly from this in terms of stability.