Description
This listing is for the **refill kit only**
Water flows through high-quality resin beads
MERV 8 furnace air conditioner filters are comparable to HVAC filters with the rating of MPR 800
Portable R
Bacteria and viruses are 5
Grodan Gro Block Improved GR6.5 Small 4" w/Hole 4" x 4" x 2.6" Strip Crystal Quest Water Filters This listing is for theDescription Product Details: Grodan Improved Gro Block Improved GR6. 5 Small 4" withHole, 4" x 4" x 2. 6" Strip 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