It depends on how my Varistream is feeling on any given day.
The setting maybe fine today, but for some reason will have to be changed tomorrow to give the same flow rate.
I now charge my battery every night but it makes no difference, seriously considering putting the old Varistream back on, as I had more joy adjusting the blue dial on the inside.
I was nearly driven to despair once, but found the problem was a kink in the hose, just where it joins onto the garden hose bit in the centre of the reel.