I use only HOB filters on my tanks and they all have scrubies for media which i do maintenace on 4-5 times a year every change of the season i rinse the scrubbies and take apart the filter for cleaning.
CHOMPERS;1952463; said:
I have some that are over two years old.
pcfriedrich;1960537; said:I don't think old carbon is harmful. actually, now that I'm thinking about it, it possibly could be. its is basically charcoal. maybe it could rot over time?
somebody help us out on this one!!
if it doesn't rot, its probably actually beneficial (hosting bacterial colonies).