At the beginning of the 20th century, a weekly Saturday night bath had become common custom for most of the population. A half day's work on Saturday for factory workers allowed them some leisure to prepare for the Sunday day of rest. The half day off allowed time for the considerable labor of drawing, carrying, and heating water, filling the bath and then afterward emptying it. To economize, bath water was shared by all family members. Indoor plumbing became more common in the 20th century and commercial advertising campaigns pushing new bath products began to influence public ideas about cleanliness, promoting the idea of a daily shower or bath.