Filter changes refer to the process of replacing or cleaning filters in various systems, such as air conditioning units, water purifiers, or vehicles. Filters are designed to trap dust, dirt, and other contaminants, ensuring that the system operates efficiently and maintains good air or water quality. Regular filter changes help prevent clogs and reduce strain on the system, which can lead to costly repairs. The frequency of filter changes depends on the type of filter and its usage. For example, HVAC filters may need to be changed every 1 to 3 months, while car oil filters are typically replaced during oil changes. Keeping track of filter maintenance is essential for optimal performance and longevity of the equipment.