The filter press is used to separate a solid-liquid mixture. The filter elements or trays and frames are tightened using a press . The filter cloths separate trays and frames. The filter operates under pressure , and the cake is deposited between the wires which in turn allows to carry out the washing of the cake. These machines are involved in multiple business sectors: mining, metallurgy, chemical engineering , food processing , water purification . etc ... , and are especially recommended when the filterability of the cake is not good .

Band filters are reliable and robust machine for dehydrating of sludge and require little energy.  They represent an interesting alternative to press filters.

The liquid to be filtered is poured into a rotating drum. This drum is made of stainless steel at its periphery paintings.  Impurities larger than the mesh are trapped against the inner face of the filter plates.

The drum rotates slowly ( 3 - 8 t/min depending on model) and causes the impurities in the output sludge channel.

Gravity filters are often used  for emulsion filtration or particles from the machining workshop.  Their main advantage is their simplicity of operation and also the prices. 

This filter is intended for the separation and removal by washing  of the solids contained in the suspensions according to the process of precipitation or crystallization or recycling of precoat residues.