It depends on a few factors including the indoor air quality, usage duration and usage frequency of the PURE A9. The small particle filter is estimated to last approximately 9000 hours. While most homes have the purifier on for an average of 12 hours per day, it’s recommended to change once a year.
The smart filter works like a timer that uses a unique algorithm to determine the filter life. A new filter includes an approximately 9000 hours of ‘filtering time’. The sensor built into the PURE A9 takes a frequent reading of micro particles in the air, calculating the amount of time the filter spends exposed to high or low quantities micro particles.