11 Water Treatment Systems Comprising Aerators, Iron and Manganese Removal Plants, Mixers, Flocculators, Solid Contact Treating Units, Carbon Absorption Columns, Recarbonators, Sludge Collectors and Thickeners, Packed Bed Reactors, Stripping Towers, Chemical Feeders, Ion Exchangers, Flow Indicators, Filters, Rotary Distributors for Filters, Clarifying Systems and Potable, Process and Waste Water Treatment Plants