Water disinfecting apparatus; Automatic animal watering system comprising chlorinating and acidifying holding tanks primarily used for water treatment to maintain water quality, also used as a drug delivery device for animal drinking water treatment, all of the foregoing sold as a unit for water treatment; animal watering systems in the nature of mechanized waterers for use in animal rearing facilities; Automatic feeding and watering system for use at animal rearing facilities comprising holding tanks, power supplies, controllers, valves, timers and associated apparatus, all sold as integral components thereof; Mechanized animal feeder systems comprised of holding tanks, power supplies, controllers, valves, timers and associated apparatus sold as a unit for enhancing potable water by introducing various solutions into a water line