What do you use for soil?

Indoor Growing
36

Well I don’t understand why more ppl don’t use it for soil mixes, perlite flies off their shelves and lava rock last longer over the years. Perlite floats to the top, blows away, crumbles, dissolves down to nothing and my lava rocks are still there and haven’t changed. I recycle my soil every grow and makes me wonder at what point I need to add more and how much on 1100 gallons of soil

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