Grodan Improved GR40 Uniblock, 8 x 8 x 4, case of 36 Growgles 100 µmol/s PPF through a

100 µmol/s PPF through a double-ended HPS platform with a German aluminum reflector rated above 96% reflectivity

and cabling in one tidy box

For large infestations

2 gallon pots

Grodan Improved GR40 Uniblock, 8 x 8 x 4, case of 36 Growgles 100 µmol/s PPF through aGrodan 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