The water can be left in the pillow for up to one year, and then it should be changed. Many people like to wash their pillows, so that is a good time to change the water, because you should empty the water from the pillow before washing it.
The water can be left in the pillow for up to one year, and then it should be changed. Many people like to wash their pillows, so that is a good time to change the water, because you should empty the water from the pillow before washing it.