STG Comparison With Other Plant Growth Substrates Product Attribute STG Rockwool Oasis Coir Perlite Soilless Mix Soil Conditioner   Weight - lb. / cubic ft. 1.0 5.0 5.0-5.55 5.0 5.1-8.6 Varies Varies Presoaking required? No Yes Yes Yes Yes No No pH neutral? Yes No Yes No Yes Varies No Wettability Instant Low Medium Low Medium Medium Medium Re-wettable? Yes No No No Yes Yes Yes Nutrient build-up on surface No Yes Yes No Yes Yes No Aeration High Medium High Low High Varies Varies Starter nutrients No Yes Yes Yes No Yes No Cation Exchange Capability (CEC) 0.0 0.0 Low 60-130/meg 0.0 Varies Varies Lung/skin irritation No Yes No No Yes No No Breakable? No Yes Yes No No No No Shelf life Indefinite Finite Finite Finite Indefinite Finite Finite Labor intensive - setup Low Low Low High High High High Labor-intensive - post harvest Low Medium Low High High High Medium Storage space required Low High Medium High High High High       / HOME / ABOUT US / THE STG LINE OF PRODUCTS / THE STG TECHNOLOGY / WHAT MAKES STG UNIQUE? / THE STG MEDIA COMPARISONS / HOW TO BUY STG / OUR TEAM OF EXPERTS / MUST READ TESTIMONIALS / FAQS / CONTACT US / STG USER GUIED /