When to replace filters:

To find out when you should replace your filters is to purchase a TDS meter (our part # 578).
This gives you a reading from your 4th stage filter (RO Membrane). If you are unsure of when the filters were last replaced, we suggest that you change all filters depending on
what the TDS meter reading gives you. The DI filters are color changing so they are easier to figure out when they need to be replaced. Our DI resin starts off as a green color and once it is a dark brown/black color, it is
time to change them.