is there a diff between them and would I be wasting my money buy the ro/di system. If anyone is intrested,I have a friend that got this system real cheap on the net, I will post the site asap. In the long run t would be cheaper and I hear its good drinking water as well

it's absolutley good drinking water ...i have to hide the gallons of RO i buy at walmart because my girls drink it on me...lol as far as RO vs RO/DI id have to say it's one more step purer ....needed? can't really say Dionization would be for a specific type of water if i understand it correctly, if you don't have that type of water , then its money that could be spent elswhere in my opinion, Boss

i believe the extra chamber increases the rejection rate in which you are trying the reach 100% (ideally)

lol i hear ya man ....I'm in the process of getting a couple acres with a small one bedroom house on it from my family....I'll be adding a 2 story adition to it ....already have the tank room designed into the living room with at least one tank in the wall, contemplateing two [one on top of the other...then all the equipment and ready water and a couple qurentine tanks can be in the room and not seen from the rest of the house......

boss if u start using ro water and notice less problems, i will immediately switch...The only reason why i still have no live stock is because i am going to puerto rico on 4/3 and i dont want my live rock to cycle whiile im gone and come back to an algae bloom and disgustin tank...so ive just been reading on everyones progress on the site...if you notice people are killing off fish here and there params were overall within the correct range..now all being well as far as Am No3 no4 ive noticed more experienced aquarists will ask you whats your temp and ph. Ph and temp can tell you a wealth of information, and changes could be a result of many factors that you might not be measuring.

who knew life gems came in a fish forum..thanks dude lol