Operating a swimming pool, spa, or water feature without an automated controller is analogous to operating your home heating system without a thermostat.  Constantly turning your furnace on and off manually is unthinkable, yet the majority of swimming pool and spa operators control chemistry in exactly this fashion.  Water balance oscilates between "under feed" and "over feed" as operators attempt to maintain chemistry control in conjunction with other work activities. As a consequence unsafe water conditions, chloramine formation, and excessive organic loading are common occurrences.   

A conscientious facility operator typically checks and adjusts pool or spa water chemistry hourly.  A CAT automated controller continuously samples pH and sanitizer activity, constantly adjusting the feeding of chemicals on a basis proportional to the demand. The results include elimination of "human error", accurate and reliable maintenance of chemical levels twenty-four hours a day, compliance with Health Department chemistry standards, reduced burden on operating staff, and a reduction of chemical usage and costs.