[Class : 11] Installations For Purifying Water; Water Purification Tanks; Waste Water Treatment Tanks; Waste Water Treatment Tanks; Wastewater Treatment Plants Included In Class 11; Desalination Plants; Disinfectant Apparatus; Distillation Columns; Distillation Apparatus; Evaporators; Filters For Drinking Water; Gas Scrubbing Apparatus; Gas Scrubbers [Parts Of Gas Installati...