Humidity releasing rock that is perfect for any fruiting chamber.

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Perlite is an amorphous volcanic glass that has a relatively high water content and is typically formed by the hydration of obsidian. It occurs naturally and has the unusual property of greatly expanding when heated sufficiently.
Since perlite is a form of natural glass, it is classified as chemically inert and has a pH of approximately 7.0. This substance is used in grow chambers to capture moisture and release humidity over a long period of time making it ideal for mushroom cultivation.
Great for keeping the fruiting chamber moist thanks again.
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Reviewed by: (Verified Buyer)  from ONTARIO. on 4/14/2017
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