Let me explain why the Black Diamond is used so commonly. It is made of sub-bituminous coal which is much harder than the Lignite carbons. That means it can be used in higher flow or even in a canister filter without breaking apart (called friability in the carbon industry). So while the Lignites are more effective, they are much less user-friendly.
The Matrix is a better carbon but it is also more expensive. _________ Curt  |