The garbage disposal is mounted to the underside of a sink and is designed to store waste food in a hopper chamber (just beneath the sink drain and the upper part of the disposal). When turned on, the motor spins the flywheel and attached impellers at almost 2,000 RPM. The attached impellers work to throw the waste food against the shredder ring and together they grind and pulverize the garbage. Water from the kitchen faucet flushes the pulverized waste material out the waste line connector discharge outlet and down the sewer system, or in some cases, into the septic system. (NOTE: Disposal usage may have some limitations with septic systems in some municipalities. Check with your local building code official.)
Tips on What to Look For When Buying:
For these things to work well you need power! At a minimum, get a 1/2 HP unit and I really recommend a 3/4 HP disposal. Having the power to grind food waste into tiny shreds and basically liquefy it is essential for the drainage system and ESPECIALLY for use with a septic system. Another feature that is important is overload protection that will turn off the motor if it begins to overheat. The electrical Reset button will pop out and turn off the unit. You also want an auto-reverse feature to prevent jamming. Definitely get a unit with a flywheel turning wrench hole in the bottom so you can manually turn the disposal's grinding flywheel if there is a jam. (See the last page of this tutorial).