After overhead tanks are cleaned, the first few seconds or minutes of water coming through taps can be muddy, full of loosened sediment and floating particles. If that shoots straight onto tiles, basins and walls, everything gets stained.
By placing a bucket or large container under the tap and letting the first round of dirty water collect there, you contain the mess. Once it runs clear, you empty that bucket carefully and then start regular use.
It’s a simple trick that saves you from scrubbing brown streaks off your bathroom surfaces later.
