The premise behind the proper use of a disposer is to effectively regard food scraps as liquid (averaging 70% water, like human waste), and use existing infrastructure (underground sewers and wastewater treatment plants) for its management. Modern wastewater plants are effective at processing organic solids into fertilizer products (known as biosolids), with advanced facilities also capturing methane for energy production.[20][21]
Discharge Pipe: The discharge pipe that goes into the drain of the sink is attached to the bottom of the garbage disposal. Either of these parts can sometimes loosen from regular use or may fail altogether with enough wear and tear.Check to be sure the connection is tight and tighten with a plumber’s wrench if necessary. If the discharge pipe still leaks, the seal that is located between the retaining nut and the discharge pipe may need to be replaced.
To be prepared, measure the distance from the outlet to the top of each disposal before you remove the old unit. If the new unit’s outlet is lower, you must also lower the tee that the discharge pipe connects to. Loosen the two nuts that connect the tee to the tailpiece above and the trap below. Try lowering the tee to see if the tailpiece is long enough. If it’s not, you’ll have to replace it with one that’s slightly longer.
There is a contradiction among some of the brands. InSinkErator’s disposal instruction manual states, “Don’t grind large amounts of egg shells or fibrous materials like corn husks, artichokes, etc, to avoid possible drain blockage.” Whirlpool’s disposal instruction manual states, “designed to dispose of food wastes including bones, fruit and vegetable wastes, pits, egg shells and coffee grounds.”
Even though a leaking garbage disposal is a fairly simple fix, there can be a few factors that can complicate the process somewhat. For example, there are a few different places within the connection system that may spring a leak, so often the hardest part of fixing a leaking garbage disposal is trying to determine where the leak is coming from.Aside from the obvious connections, possible areas for leaks include water inlets and outlets as well as rings and seals.
Another common cause for a leaking garbage disposal is the disposal flange. A leak at the very most upper area of the garbage disposal could be the garbage disposal flange which goes through the sink. A garbage disposal flange should be sealed with Plumber’s putty and then tightened from underneath the sink. If this is not tight enough or if it has managed to come loose (which can happen) then the garbage disposal will have to be taken down so the flange can be resealed and then the garbage disposal can be rehung.

Garbage Disposal