Well no one else will answer so I will. I have a RO unit from Cotsco, cost about the same amount. It seems to work fine for me. I am also very happy with it because insted of buying the water from the store all I have to do is walk over to one of the jugs and pour it in the tank.
TDS = Total Dissoled Solids. Do a google search to find out what that is. Too many people call me an idiot when I try and describe something.
Scott