doesn't gum up in it? Is there a filter on the outlet if you want to run something finer than beads?
BTW, how did you fare with the bio beads? I am convinced they grew cyano
Sorry OP....hope we answered your question.
I run carbon continuously as I have a heavily populated coral reef and carbon keeps the toxins down.
I also use Purigen. It can be regenerated and it always sits there available to suppress a DOC
spike. It also scrubs out selenium which can promote cyano
Phosguard and GFO
are pretty exchangeable as they do basically the same thing, grab phosphates.
All good products that can work in combinations without harm.