System for fluid treatment having fluid release cycle

A system for treating water, said system comprising:

• a water treatment reservoir;
• an electronic programmable controller, said programmable controller capable of displaying visual indicators on an output display screen and capable of receiving input from a plurality of push buttons;
• and
• a valve body comprising:
• a first fluid inlet port;
• a second fluid inlet port;
• a first fluid outlet port;
• a second fluid outlet port;
• and
• a valve including a piston selectively longitudinally positionable by said programmable controller to direct fluid flow between said ports to execute a regeneration cycle comprising a service stage, followed by a backwash air stage, followed by a backwash stage;
• wherein said programmable controller and said valve body are coupled to and supported by said reservoir;
• and
• wherein said valve is configured to direct,
• while the piston is in a first static longitudinal position during the service stage, fluid flow from the first fluid inlet port to the water treatment reservoir and from the water treatment reservoir to the first fluid outlet port,
• while the piston is in a second static longitudinal position during the backwash stage, fluid flow from the first fluid inlet port to the water treatment reservoir and the first fluid outlet port and from the water treatment reservoir to the second fluid outlet port,
• while the piston is in a third static longitudinal position during the backwash air stage, the third static longitudinal position being located between the first static longitudinal position and the second static longitudinal position, fluid flow from the first fluid inlet port to the water treatment reservoir and from the water treatment reservoir to the second fluid outlet port.