- Location
- Long island
Hey i was just wondering how you know when and how often you change your ro/di filters? I have a 4 stage unit and the bottom of my carbon cartridge is starting to change to the brownish color. Obviously its going to have to be changed soon but i was wondering is people wait until its completely brown or not. Also do you recommend change all 4 cartridges each time?
thanks in advance!
thanks in advance!