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scoria as media


steve sisson

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I have used it in cannister filters and it seemed to work fine, however I would use it as a last resort, i.e. if finances just dont allow you to buy proper media. There are two reason for this, 1) proper media IS better, it is made/designed specifically for the job. 2) when natural rock like this is formed (includes pumice to) it can (often?) have other stuff mixed in with it, metals, other types of possibly reactive rock etc. This can be seen clearly in pumice by the different coloured lumps if you saw a piece in half.

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