What are the six Control Valve functions and what does each one do?

The six functions are: Filter (filters pool water, used 99% of the time), Backwash (cleans the sand bed by pumping water upward through the sand), Rinse (levels the sand bed after backwashing), Closed (stops water flow between filter and pool), Drain (drains water from the pool out of Port D), and Circulate (circulates pool water bypassing the sand filter, used if the filter is broken). Always switch off the sand filter before changing the Control Valve function. (Page 7)