hey i got your 50gpd setup... i was lookin at the tank and thought hey, I could T off the output and hookup 2 tanks and have 6 gallons on demand! think it will work? OR do you offer a bigger tank? also, ive had the r/o for nearly a year, we drink, cook, fill tanks with it.. is it time to change some filters? if so which ones. I dont have a TDS meter, but thats next. Im sure Ill need at least a prefilter. what are the timetables on membrane replacement?? I estimate, Ive made about 5-600 gallons out of the thing so far..