While replacing humidifier filters, the most important thing to consider is it should be clean and must be able to fit properly. This is necessary in order to get the most efficient performance from the appliance. Humidifier replacement filters are intended to be used once an existing filter gets dusty, dirty and obvious debris can be seen on its fibers. It should also be replaced after a year of use, even if there is no apparent build up.
One may not always be able to see the microscopic particles and especially the mould spores that can form on humidifier filters, but a regular replacement may be required. One must know that for all humidifiers it is important to know that filter replacement time is largely dependent on how hard the water is and how often the unit is being used.
