so let's start out by saying i know NOTHING about this subject, other than the fact that every week i'm going to my LFS and buying 15gal of pre-mixed RO/DI water. also, i've only been keeping SW for around 6 months(FW my whole life) i'm looking into buing a ro/di system, but from what i'm seeing is they range quite a bit, like making 75gal/day. well, all i really need is one that can do 15gal in a day or two. even if it takes a week to do 15 gal, that's fine too. is there anything that small? because i apparently don't know where to look or what to look for. also, like i said, i know NOTHING. what all do u have to aquire, and what all do u have to do to set up one of these systems? ANY help would be appreciated!