How do I prime the water supply system for the PurePour™ Water Filter?

Hold a glass against the paddle for about 4 minutes to purge air from the system, then continue dispensing at least 1 full gallon (3.78 L) of water and discard it. Priming must be done after installing the water filter and before dispensing water for the first time. Skipping this step may result in the first glasses of water being discolored or having an odd flavor. (Page 2)