as far as i kno matrix, is carbon, only formed into sphere's(sp? lol ) thing with carbon is it cna very depending on what its made out of i belive. i talked to a seachem rep and he sayd it should last twice or more logner then other activated carbon products, honestly who knows if its tru are not. im ususing soem right now, but its noly been running for like a week haha. so duno what to tell ya really.