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Perlite (10ltrs) perfect for mushroom shotgun fruiting chambers.
From our suppliers website "Perlite is a naturally occurring volcanic rock which, when heated to high temperatures, produces lightweight micro-porous granules." which is pretty cool sounding.
Perlite is generally used in shotgun fruiting chambers to create a humid environment for your mushrooms to thrive in.
It's safe to use, but can be a bit dusty, so maybe break out your old COVID era mask for this one or add water to suppress the dust.