+1 on the RODI system, I have a 150 GPD/ 0TDS system from the same company and it works great! only get about 110 GPD honestly but its plently for what I need. Just found this thread and it is great! Your system is amazing and you can tell that it was well planned and thought out vs how most of this industry functions, IMPULSE, IMPULSE, IMPULSE! Who is your LFS as I live in WeHo and am alwasy looking for new spots? I know you're probably not a chemicle guys but Chemiclean works wonders for cyano, just make sure you turn your skimmer off for a few hours after dosing.