In the Mirai live propagation primer video, the grower says that he washes and reuses all perlite from the propagation process, resulting in perlite that gets used and reused over a decade.
Can pumice be similarly washed and reused?
I screen and reuse pumice and other soil. I like to sun dry it first to both kill off some of the microbes and other organic material. Just remember to wear a good dust mask since there will always be some very fine dust.
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