A grit chamber is a device designed to :- protect a wasted water decontamination intallation or rainwater pre-treatment against the arrival of large objects which risk to block the installation- to separate and evacuate voluminous matter hunted by the effluent and which would distrub the good working of the device.We propose the DEG2 with tank in high density polyethylene equipped with rake basket produced in galvanized round bar. The rake basket is removable, so make the mainteance easier.The grit chamber settle down before the decanter digester, all-wtaers tank or oil separator.For the wole of our range :- decanter digester : DV3/06000 to DH3/30000- all-waters tank : 8000 to 25 000 l- oil separator : 1,5 to 15 l/s