Grodan Gro Block Improved GR4 Small 3" No Hole 3" x 3" x 2.6" Strip food-storage The holes and the shoulders

The holes and the shoulders at the bottom help the drainage of water and avoid the formation of rotten parts

Non-return thin louvers that close when fan is not in use to prevent outside air and debris from entering

This high-PFF MH lamp delivers optimized full spectrum plant biologically active radiation

The respective companies lead the field in LED R&D

3 CFM Single Stage Mini Vacuum Pump

Grodan Gro Block Improved GR4 Small 3" No Hole 3" x 3" x 2.6" Strip food-storage The holes and the shouldersNew Grodan Improved! Improved product at current pricing. New density + new hydrophilic technology = better water distribution and root development. The uniform distribution of water and nutrients throughout the block allows for more efficient use of the entire substrate volume Full saturation of the blocks with no dry spots and improved EC control with less water is achieved in the rootzone due to the uniform, optimized wool resulting in a