I dont have a RO/DI unit yet but I notice that I am not the only one confused about installing them. I found this on HD's site and thought it might be useful. It says its for using a water purifier but it seems like it should work for RO/DI units as well ( which are the same thing really, no? ) Anyway, tell me if this is right.
http://www.homedepot.com/prel80/HDUS/EN_US/diy_main/pg_diy.jsp?CNTTYPE=NAVIGATION&CNTKEY=help%2findex.jsp&BV_SessionID=@@@@0020929451.1153963839@@@@&BV_EngineID=cchgaddigmdlihlcgelceffdfgidgll.0&MID=9876&pos=t11
http://www.homedepot.com/prel80/HDUS/EN_US/diy_main/pg_diy.jsp?CNTTYPE=NAVIGATION&CNTKEY=help%2findex.jsp&BV_SessionID=@@@@0020929451.1153963839@@@@&BV_EngineID=cchgaddigmdlihlcgelceffdfgidgll.0&MID=9876&pos=t11