Machine that grinds food waste, milk cartons and some of the other disposables with running water and then extracts the water, resulting in a semi-dry pulp; waste may be reduced by up to 80 percent.

In agriculture, a pulper is a machine designed to remove pulp i.e. the soft flesh from agricultural produce. For example, in coffee growing the ripe, red cherries are picked from the coffee bushes and prior to fermentation and later drying the soft pulp needs to be removed (otherwise a potentially uncontrollable fermentation/rot will occur). In the case of coffee the pulping is normally done in a pulper that is either hand-cranked or engine-driven; the beans are emptied into an elevated hopper and then dropped through a narrow slot within which they come into contact with a rotating spiked drum that removes the pulp or flesh.