Grodan Improved GR40 Uniblock 8" x 8" x 4" case of 36 LUXX 200W BAR so you'll have 30 days

so you'll have 30 days of protection with each 2-pack

including cleaning

ERA® 6500 & 9500 to prevent bacteria growth

and events

100% natural plant growth nutrient supplement blended from pure plant oils and extracts

Grodan Improved GR40 Uniblock 8" x 8" x 4" case of 36 LUXX 200W BAR so you'll have 30 daysDescription Product Details: Grodan Improved Uniblock GR40, 8" x 8" x 4" Grodan partnered with the Wageningen University and Research facility in The Netherlands and top growers throughout North America to identify the optimal stone wool substrate and irrigation strategies for specialty crops. The result of months of scientific research and trials is Grodan Gro Blocks Improved with Grodan's Advanced Wetting Agent. These leading edge blocks have the