you can put pressure guages in between or one of $10 flow meters before system. RO membrane doesn't remove chlorine iirc or vocs. On the other side chlorine de

you can put pressure guages in between or one of $10 flow meters before system. RO membrane doesn't remove chlorine iirc or vocs. On the other side chlorine degrades membrane. "nominally clean tap water" can have enough dirt to clog membrane if you don't auto backflush it frequently