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What substrate properties mean: air space, water holding, CEC
Coir: one word, many products, and how to buy it by specification
Preparing coir slabs: washing, buffering and wetting up
Rockwool (stone wool)
Sawdust, pine bark, perlite and sand
How much substrate a plant needs
Between crops: reuse, cleaning and disposal

Growing media

Between crops: reuse, cleaning and disposal

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