This application includes companies engaged in cold-rolling steel sheets and strip and hot-rolled steel sheets and strip. A water-based coolant is used and requires continuous filtration to minimize build-up of solids which could cause defects and staining on the sheet finish. For the larger flow rates associated with steel rolling, an Hydro Band Filters, Double Disc Filters or Air vacuum filter and magnetic separator are typically used. Complete system packages including tanks, pumps, heat exchanger and controls can be proposed.