Grodan Gro Block Improved GR6.5 Small 4" w/Hole, 4" x 4" x 2.6" Strip - Case of 216 spl_allstate Removes 98%+ of all contaminants

Removes 98%+ of all contaminants in your tap water including chloramines

Home Grower

These lamps can also be combined with HORTILUX's 420

At 1/4" OD

Foliar Spray: Add 5-15ml/gallon of water

Grodan Gro Block Improved GR6.5 Small 4" w/Hole, 4" x 4" x 2.6" Strip - Case of 216 spl_allstate Removes 98%+ of all contaminantsGrodan 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 Grodans Advanced Wetting Agent. These leading edge blocks have the optimal fiber structure and physical properties for crop uniformity, more