Grodan Improved GR40 Uniblock, 8 x 8 x 4, case of 36 Water Filters + ROs Systems The holder is made from

The holder is made from high-quality cedar wood

so this carbon stage protects the membrane downstream

Check out GrowersHouse propagation tray/domes options

Humidity<90%

Grodan Improved GR40 Uniblock, 8 x 8 x 4, case of 36 Water Filters + ROs Systems The holder is made fromGrodan Improved GR40 Uniblock, 8 x 8 x 4, case of 36 Growershouse. com is proud to introduce the Grodan Improved Uniblock GR40, the culmination of extensive research and partnerships with top institutions and growers. Created in collaboration with the Wageningen University and Research facility in The Netherlands, and with feedback from leading North American growers, this product represents the pinnacle of stone wool substrate technology. Key