I have been using Seachem Purigen in the filter section of my Fluval Spec V aquarium for a few months now. I recently pulled up the filter material and the Purigen has now turned a nice, dark brown patina. Their instructions have the following to say about when to clean: “Exhaustion is indicated by a pronounced discoloration of the beads to dark brown or black.” While not yet black, I couldn’t help myself
How to Regenerate / Clean Seachem Purigen
