THE THINKING TUB

hot tubs; spas in the nature of heated pools; water purification units for monitoring, dispensing and control of sanitizing chemicals in swimming pools, spas and hot tubs; water purification systems comprised of liquid storage vessels, liquid pumps, chemical sensors, liquid level sensors, timers, alarms, and electronic controllers for monitoring, dispensing and control of sanitizing chemicals in swimming pools, spas and hot tubs; water purification units for monitoring and control of water and chemicals in swimming pools, spas and hot tubs; water purification systems comprised of liquid storage vessels, liquid pumps, chemical sensors, liquid level sensors, timers, alarms, and electronic controllers for monitoring and control of water and chemicals in swimming pools, spas and hot tubs