ok. starting from right side (as picture is veiewd) the black tube goes into the pre filter, just below the gauge, then from that to the carbon filter (bottom middle) then from there to the RO
Membraine which is the bigger Horizontal one. the in is the single center connector. then on the other end of the RO
is two out's, one in the center and one towards the outside. the outside one is the waste line (yellow tube) that just get dumped down the drain. the center tap goes to the UV
(smaller top cylander) right side as you look at the pic, then out the other end down too the DI
, wich is the third vertical cylander in the ride side (by the middle canister) and then out the end (left side) with some blue tube and that is the good water.