The specific weight of oil and grease is lower than the specific weight of water. For this reason oil and grease will settle on the surface of the water. The most part of the oil will settle on the longitudinal clarifier. The flow of the water in the longitudinal clarifier will drive the floating oil and fat to the outlet of the basin. The floating oil and grease will be stopped by a downflow baffle. The water floats underneath the downflow baffle into the pump chamber. From there the water will be pumped into the gravel filter and back into the factory. On the water surface in the longitudinal clarifier grease, lubrication oil, hydraulic oil and other hydrocarbons mixed with scale and particles, float on the water. It is extremely necessary to remove the floating hydrocarbons. Otherwise oil and grease will accumulate in the gravel filter and finally will block the gravel filter.
The easiest way to remove the floating oil and grease is an adjustable channel.