Why did the Indus Valley civilization pay more attention to hygiene

The Indus people were fully aware of the principles of health and sanitation. Towns people bathed in a bath located in the centre of the quadrangle in the middle of the valley. The Baths were around 49 feet long, 28 feet wide and 8 feet deep. Walls of the pool were made up of burnt brick to prevent the leaking of water. The pool was regularly drained to ensure cleanliness, this was done by draining off used water into a large pipe that led to the outside of the valley. The bath had 6 entrances and all contained stairs that led into the water. This building reflects the engineering genius of those in ancient days.