Barliman
Aquarium Advice Addict
Hi all,
So, I have a bag of Purigen in one of the filters on my 20-long tank. It's been in for a couple of months and, while doing maintenance on the filter last weekend, I noticed the Purigen had darkened to a milk chocolate or coffee with cream color.
How dark does it have to get before I should replace/recharge it?
So, I have a bag of Purigen in one of the filters on my 20-long tank. It's been in for a couple of months and, while doing maintenance on the filter last weekend, I noticed the Purigen had darkened to a milk chocolate or coffee with cream color.
How dark does it have to get before I should replace/recharge it?