Equipment for the continuous separation of coarser undissolved substances from wastewater of various nature. The filter medium is a perforated screen or slot with round or longitudinal holes. Trapped dirt is removed by a brush mechanism. The working medium is equipped with a hinged splash-proof cover. For outdoor use, the grilles are equipped with a double-layer casing with a built-in heating element. The heated version includes a thermostat that allows heating to be turned on in sub-zero temperatures and off when warming.