Ross 100047069 039044102333 Root Feeder Economy Model #102A, for Use with Fertilizer Refills Ross Root Feeder System stops pollution from fertilizer run-off and costly waste of water from evaporation Deep feeding fertilizer system supplies nutrients at the root level, where the active roots are growing; Use With Ross Root Feeder Fertilizer Cartridges (not included) Encourages deep root development for improved tree and shrub stability Adjustable Flow Rate Lever Allows Light Or Heavy Watering / Fertilizing; Ideal for Watering During Droughts Ross Root Feeder available in an economy model with 1 year limited warranty and a heavy duty model with 3 year limited warranty