Manufacture proper the suitable for in-channel installation for small scale treatment system. It is used to reduce the solid matter load of the fine screen after coarse screen. For cleaning the screen , there is a screen harrow , the solids materials that are moved upwards with harrow are collected in the performed basket behind the grill an removed from the system when necessary. The performed basket is manufactured in such a way that it can be re- inserted after being removed and emptied for easy removal of solids from the system.