FAQ: I saw on the internet that Seachem Matrix™ is just pumice. Is that true?

We certainly understand why people look at Matrix™ and compare it to pumice; they are both porous stones. But remember, not every porous stone is the same. Matrix™ is a specific type chosen for its extremely high porosity, pore size, durability, and inert nature. When you buy Matrix™, you know what you are getting. It has been tested in the lab and in thousand of hobbyist's aquariums for more than a decade with excellent results. You aren't just purchasing the physical material when you buy a container of Matrix™; you are purchasing the research which has sourced and tested this specific type of stone, and the assurance that it is safe for use in your aquarium.