Electrical conductivity measuring meters for use with water and aqueous solutions, as well as replacement parts therefor within this class; pH measuring devices for use with water and aqueous solutions, as well as replacement parts therefor within this class; Devices within this class for measuring, monitoring, or logging the physical parameters of water or aqueous solutions, namely, conductivity meters, pH meters, [ ORP (Oxidation Reduction Potential) meters, redox meters, dissolved oxygen meters, moisture meters, Ion selective meters, ] chlorine meters, and electronic equipment capable of receiving and logging data information from the aforesaid meters; Control devices for monitoring water and aqueous solutions, and for controlling the dosing of additives thereto, namely, dose controllers, dose control monitors; Electrical control devices monitoring water and aqueous solutions, and for controlling equipment maintaining monitored characteristics of the water or aqueous solution within defined limits; [ Electronic controllers for water heating elements; ] Solenoid valves within this class; Metering and dosing apparatus for dosing water to maintain the quality of water within defined limits, namely, automated dosing units, automated metering units, automated pH balancing units comprising the dispensing of pH adjusting reagents, automated pH balancing units comprising the dispensing of pH buffers, [ automated water softening units comprising the dispensing of reagents adjusting water hardness, ] automated pH balancing units comprising the dispensing of pH adjusting reagents, [ automated water clarifying units comprising the dispensing of reagents increasing clarity, automated sanitization units comprising the dispensing of sanitizing reagents, ] automated nutrient dosing units comprising the dispensing of plant nutrients; Automatic and semi-automatic dosing systems for introducing additives to water in pools and spas comprised primarily of a dose controller, reagent reservoirs, pumps and valves; Automatic and semi-automatic dosing systems for introducing additives to water supplies for horticultural or agricultural use comprised primarily of a dose controller, reagent reservoirs, pumps and valves

[ Water conditioning units, as well as replacement parts therefor within this class; Apparatus within this class for treating water, namely, water filters, water sanitization units, and water purification units, as well as replacement parts therefor; Plumbing fittings, namely, valves within this class for controlling fluid flow ]