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Actual surface area isn't the end all answer - Some pores are simply too small and over time will get clogged with either detritus or dead bacteria and become useless. Matrix is about the highest out there next to ehfisubstrat pro, and it's basically pumice.It's probably better to start giving actual published surface area data for the media instead of people saying "mine's better than yours". Apples to apples, you know.