Grodan Improved Gro-Block GR4 Strip 3" x 3" x 2.6", with Hole | Case of 48 Deep Water Culture | DWC Some applications may require different

Some applications may require different dosages

Ideal for users that do not calibrate frequently

Comes with instructional videos and guides

Contains: Canadian Sphagnum peat moss (75-85%/volume)

Grodan Improved Gro-Block GR4 Strip 3" x 3" x 2.6", with Hole | Case of 48 Deep Water Culture | DWC Some applications may require differentGrodan Improved Gro Block GR4 Strip 3" x 3" x 2. 6", with Hole Grodan's Improved Gro Blocks utilize improved hydrophilic technology and density for better water distribution and root development. Non Shrink Wrapped. Available with pre cut holes for easy planting. Block Size: 3in x 3in x 2. 6in Strip Size: 24" x 3in x 2. 6in. Blocks Strip: 8