11 wastewater treatment systems, namely, recirculating systems for treating and recycling wastewater, consisting of storage tanks, treatment tanks, supply tanks, agitators, filters, pump, pH monitors, pH probes, and oil skimmers, all sold as a unit; separating systems for removing contaminants from wastewater, consisting of storage tanks, supply tanks, settling tanks, recirculation tanks, filters and pumps, all sold as a unit; [ evaporating systems for use in wastewater treatment, consisting of heated storage tanks, blowers, pumps, level controls and condensing units, all sold as a unit; ] and filtration systems for use in wastewater treatment, consisting of tanks, filters and pumps, all sold as a unit