Grodan Gro-Block Improved GR22, Jumbo, 6 x 6 x 4, Case of 64 Seaweeds both proven fertilizers that have

both proven fertilizers that have been used for centuries to enhance plant growth

RO protection: First-stage sediment removal keeps particulate off your carbon filter and RO membrane

A 24-hour cycle with 10-60 minute sunrise and sunset ramps eases plants into and out of each day

Efficiency & Sustainability: Not only do these blocks promise better growth

Hydroponics

Grodan Gro-Block Improved GR22, Jumbo, 6 x 6 x 4, Case of 64 Seaweeds both proven fertilizers that haveGrodan Improved Jumbo (White Foil) 6 x 6 x 4 (Case of 64) Keep it Real Real Science 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. The result of months of scientific research and trials is Grodan Gro Blocks Improved with our Advanced Wetting Agent. Real Improvement These leading