<a href=showthread.php?s=&postid=12247071#post12247071 target=_blank>Originally posted</a> by seapug
I have a PhosBan reactor that I typically use for running Carbon. I had read all kinds of great things about Purigen so I thought I'd give it a try in the reactor. First, The particle size of Purigen is very small and light so it's even harder to keep in in a reactor setup than GFO, which is like sand. After about 3 weeks of running in reverse like I normally do with Carbon (water down through the media instead of upflow) the top 1/2" compacted into a brick like mass that started restricting flow. When I switched it to run upflow it worked better, but just didn't seem to be doing much. Once I started noticing the return of the green film on my glass and diatoms on the sand I decided to end the experiment and dump the Purigen. I went back to the Seachem Matrix Carbon and my water got nice and clear again and the films disappeared.
Just my experience.