Horticultural Perlite
Perlite (smaller chunks than Sponge Rock, but of the same material) is a naturally occurring, mixed glassy silicate of volcanic origin which 'pops' when furnaced. Its unique internal structure consists of numerous tiny closed air cells surrounded by a large exterior irregular surface. Expanded Perlite is ultra-light
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Perfect
I put the rest in a zip lock baggie it was perfect!!
