... disposal an easy and clean job; Help to keep the stairway, the environment in the community healthy and clean.2. To Environmental Protection ... , biogas, fume, etc. Correct Operation Procedure1.Remove the plug from the tank. Open the tap to let adequate flow of cool water ... . To improve work efficiency, our engineer recommends to cut the wastes such as watermelon peel, fruit shell, orange peel, corncob ...