Final answer:
In-line filters should be changed regularly to maintain their effectiveness in trapping pollutants. The recommended frequency of filter changes may vary depending on different factors, but it is generally recommended to change air filters every three to six months and water filters every six to twelve months.
Step-by-step explanation:
In-line filters should be changed regularly to ensure their effectiveness in trapping dust and other pollutants in the air or reducing the concentration of solutes in tap water. The frequency of filter changes may vary depending on factors such as the type of filter, the level of pollutants or contaminants, and the manufacturer's recommendations. Generally, it is recommended to change in-line filters every three to six months for air filters and every six to twelve months for water filters.