Closed loop filtration system pumps water through series of filters and resins to filter down to 0.35 µ total dissolved solids controlled. When cutting machine idles, water is recirculated and filtered with clean water overflowing to dirty tank. System can be used in facilities without drain and treats makeup water to OEM specification. Optional chiller and hydraulic pump cooling are available in 1-15 ton sizes. System is suited for waterjet cutting industry.