How do I prepare the sand filter for first-time use?

Before first use, you must perform a Backwash followed by a Rinse cycle to wash the sand. Set the Control Valve to Backwash, run the filter for 3–5 minutes until the water runs clear, then switch to Rinse and run for 1 minute. Switch off, set the valve to Closed, and top up pool water as needed. (Page 8)