The roll-off style container filter is an economical way for separating and dewatering sludges, slurries, and waste streams. The material can be pumped or conveyed by other means into the roll-off container filter for liquid/solid separation. Liquid drains through the installed filter media panels and out of the container via discharge ports. The applications of this filter include dewatering grit and screenings at sewage treatment plants, dewatering fly ash at power plants, dewatering lagoon sludge and remove solids from storm water runoff.