For optimum efficiency and filtration, it is recommend that you replace your disposal filters at least 1-3 months. If you have washable filters, they should be cleaned at least once a month. If you have animals, you may need to replace/clean filters more often.
Washable filters are more environmentally friendly as the need to replace them is reduced, but maintenance is more involved as they need to be cleaned more often.
Why should I have a smart thermostat?