Have bioballs and matrix in one canister. Have lava rock in a make shift plastic drawer with water running through it. Working good for now.I should have said these will be used in a canister. Are you using lava rock in canisters? I do have some matrix too, just a small bag to try it out.
PumiceOk, thanks guys. So with the expensive name brand stuff your pretty much just paying for the name on the box. It's the eBay stuff I was looking at, 6 one pound bags of ceramic rings for $13 I think. Is there a generic option for matrix?