Grodan PAR10 Block 4 x 4 x 4in w/ Hole - Pallet of 1,584 blocks Wing Reflectors 20% more effective than MERV-11

20% more effective than MERV-11 and 65% more effective than MERV-8 filters

offering a combination of durability

Size: 22 x 23

12" round return collar

or recirculating

Grodan PAR10 Block 4 x 4 x 4in w/ Hole - Pallet of 1,584 blocks Wing Reflectors 20% more effective than MERV-11Grodan PAR10 Block 4 x 4 x 4in w Hole Pallet of 1,584 blocks The Grodan PAR10 Block 4 x 4 x 4 in with Hole is an industry leading rockwool growing medium, engineered to deliver superior moisture control and create the ideal environment for healthy, vigorous root development. Designed with precision for hydroponic systems, these blocks help optimize water retention while providing ample oxygen to the roots, ensuring robust plant growth. Each block