Purigen Filtration Bags

[Zoaelite]

Purigen works very similar to carbon but it claims to have absorbant properties 500% greater than its black counter part. I personally love most of the Seachem products and purigen is no exception. You do not have to worry about over filtration. No such thing as to little nitrates.
Levi

[Pan]

Just remember that certain things can cause purigen to become toxic, when regenerating it.

http://www.seachem.com/support/forum...=purigen+toxic