Hydraulic olive press

Definition: 

Like a hydraulic car jack, the piston squeezes the paste which has been applied to stacks of filter-like discs. In the picture below, the press is on the left.

Advantages:

limited investment

simple and reliable machinery

low energy consumption

pomace has low moisture content

tolerates rocks and sand without wear

no water added, minimal vegetable water disposal

Disadvantages

labor intensive

material left on mats decomposes if not properly cleaned and stored

can produce chemicals responsible for winey and fusty defects

discontinuous process