Grodan Grow Chunks (2 cu.ft.) Water Pumps & Irrigation Supplies High quality molded impeller

High quality molded impeller

Exempt from residue tolerance

DES-X is compatible with biological control agents

Here's the specifications for the Grower’s Choice Horti-Tech LED (ROI-E420):

Grodan Grow Chunks (2 cu.ft.) Water Pumps & Irrigation Supplies High quality molded impellerGrodan Grow Chunks, 2cf bag, 3 BAGS PER CASE Super light and super versatile. Grow Chunks are a larger version (3 4" square) of the popular Grow Cubes. They are great for direct planting or for use as a filling around blocks in containers. They can be easily mixed with other media for increased aeration and added moisture holding capabilities.