Water and wastewater treatment equipment and systems; water equipment and systems for creating, monitoring, feeding, and managing disinfectant into water and wastewater systems; potable water mixers and mixing systems; chemical feed feeders, pumps and systems; wastewater treatment apparatus, namely, water treatment unit for creating, monitoring, feeding, and managing disinfection and circulating water; chemical treatment units for water treatment; water and wastewater treatment installations, namely, water treatment apparatus; water and wastewater treatment installations, namely, sustainable onsite water and wastewater treatment systems; flow indicating meters; machines for mixing polymers and water; polymer activators and accessories therefor, namely, retention chambers, pressure reducers, output boosters, backflow preventers, water flow sensors, calibrators, tables, shelves, control panels, pump controllers, mixers, calibration cylinders, static mixers, and controllers; water aeration equipment and systems; structural parts and fittings and accessories for all the aforesaid goods