摘要:
A method of controlling duration of a backwash cycle of a filtration system commences with initiating pumping of a backwash fluid (12) through a filter (6) of the filtration system by way of a backwash pump (17). The flow rate of backwash fluid (12) is maintained to within 20% of a predetermined flow rate. A pressure sensor (23) takes a pressure measurement indicative of a pressure differential between upstream and downstream sides of the filter (6). Changes in the pressure measurement over time are monitored. A backwash duration controller (18) stops the backwash pump (17) when a rate of change of the pressure measurement reaches a predetermined minimum value.