Will water moving at a certain flow rate always have the same feed pressure?
The flow rate and the feed pressure are independent variables. Flow rate depends on the feed pump, which pumps water at 4.4 m3/hour. Feed pressure depends on the amount of resistance that the water encounters.For example, water flowing at 4.4 m3/hour might have a feed pressure of 1 bar going into the sand filter, but 0.5 bar on the way out.