AZOO's Plant Grower Bed provides a stable nutrient base for aquatic plants to thrive in. The granular structure creates an open network of spaces to allow unrestricted growth for a healthy root system. The Grower Bed helps to keep pH stable in the aquarium and delivers nutrients for up to 18 months from initial planting setup. AZOO's Grower bed is cleaner and clears faster than competing brands. It does not need to be rinsed. Considered the Standard to compare to by advanced hobbyists. Clarifies water for 12-18 months while helping to remove color like the brown water from driftwood Improves water quality Prolongs the time needed in many cases between water changes in planted aquariums Use 1 bag per every 10-15 gallons of water Covers approximately: 30 x 12.5 at 1 deep; 20 x 9.5 at 2 deep Made in Japan Multi size Tan semi round pellets.