Like the Eiffel tower, They start painting at the top and work thier way down
When they get to the bottom, they go back to the top and START AGAIN.
Such is the cycle of our cleaning schedule of your water supply. We keep a record here of what pipe cleaning (Scouring) has happened and when it will happen next close to you, and we let you know when it will occur next and what precaution, if any, you need to take,