Grodan Gro Block Improved Jumbo, 6" x 6" x 4" w Hole (Pallet of 704 Loose Blocks) DYFOL032 This lamp uses our custom 14BW082094 This lamp uses our custom designed high efficiency white light Quantum Boards Compatible for use with the Bluelab Guardian Monitor Water distribution is more uniform throughout the entire block which is the basis for a well defined root system with higher capacities for water and nutrient uptake to produce robust and vigorous crops Grodan partnered with the Wageningen University and Research facility in The Netherlands and top growers throughout North America to identify the optimal stone wool substrate and irrigation strategies for specialty crops