ordered booster pump from daqua yesterday, and already produced 250 litres using it and im miles away down here in suffolk. very good service and what a difference that booster makes to my 4021. 10 litres in 6 minutes and much less waste to pure. So chuffed with it. many thanks to doug at daqua and everyone on here who suggest the need/benefit of a booster. will certainly pay for itself and sure does make my beer taste sweeter too ( not literally, Im not sure on boosting home brew) ? ? :1f609: