I'm trying this stuff next as it seems to be the same thing from what I've been able to gather from other folks on here. http://www.greenhousemegastore.com/p...oil-amendments
If indeed it is a comparable product you should be able to cover a T8 with maybe 1/8-1/6 of a block. I cover 2 T8s with 1/4-1/3 of a block of reptichip.
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