Patent ID: 7632402
Filing Date: 2009-12-15
Classification: C02F,E04H

Abstract:
1. A system for cyclical control of a water characteristic in a body of water without a sensor comprising: a time-based cyclic controller responsive to a display, said cyclic controller having a fixed time period during which the cyclic controller repeatedly generates a duty cycle as a portion of a cyclic output signal having a first signal and a second signal with the first signal different than the second signal; a display switch for an operator to manually set the duty cycle wherein said duty cycle is maintained until manually reset by the operator, said display switch comprising a manual operator control wherein the cyclic controller is integrated to a spa control system with the cyclic controller responsive to the manual operator control in a spa display pad; and a valve responsive to the first signal and the second signal to periodically deliver a water characteristic affecting material into a body of water in response to the duty cycle to thereby either maintain or change the water characteristic of the body of water.