Grodan Improved GR40 Uniblock, 8 x 8 x 4, case of 36 Aeroponic Urea: This nitrogen source is

Urea: This nitrogen source is carefully integrated to gradually release nitrogen

72% is published for cigars and dry-climate humidors

Capable of handling 18 to 27 lbs

These are food grade nylon

The product comes in a 5lb bag

Grodan Improved GR40 Uniblock, 8 x 8 x 4, case of 36 Aeroponic Urea: This nitrogen source isGrodan 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