Grease separators are used wherever animal or vegetable fats are carried into waste water. Commercial kitchens must have pre-treatment plants to ensure that solids and liquids that release harmful or unpleasant vapours or interfere with operations are not discharged into the public sewerage network. Otherwise the fats, oils and grease (FOG) contained within greasy waste water put the pipe system, drainage equipment and wider sewer network at risk. Fats, oils and grease are deposited with other wastewater components on the walls of the pipes and can lead to corrosion, blockages and unpleasant odours.
In businesses which generate waste water containing fats, oils and grease, grease separators should be installed in accordance with EN 1825.