Quote Originally Posted by satomi325 View Post
Overpriced perlite with a special name.

You can get a huge bag of Perlite for the same price at a garden or hardware store. Just make sure there aren't any extra fertilizer or additives in it.

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That's not what the OP was asking. But anyway, Hatchrite is not perlite, you can reuse it indefinitely, and it's fool proof.