What i meant is Fluval Pre Filter Media at the base of the bottom basket, only purpose is mechanical filtration for large particles...its inert and non porous unlike the bio max.jason081180 said:That way wouldn't be good. I have 2 Rena XP3's. The Rena filter flows from the bottom to the top. So the biggest pore filter foam needs to be the first the water comes in contact with. Then once all the stuff is filtered out of the water you want to have the bio filter and if you want a micron filter.
Since Rena filters pull water from the bottom, I would go, from bottom up, Black foam 30-Black Foam 20-ceramic rings of choice-white filter pad or polyester stuffing.Mudkicker said:i have decided to change around the media in my XP2.
bottom basket
fluval ceramic rings - media seperator - rena foam 20
top basket
rena foam 30 - media seperator - fluval bio max
ill let you know how it works out.