It is recommended that you replace your compost bin filter about every 3-5 months but you can easily remove the filter and rinse as needed. The filter measures 5" in diameter. Special Instructions: You can rinse the charcoal filter as needed with some soap and water. Allow to dry before placing back into the compost bin. Why it matters: It is estimated that 30-40% of all food is wasted in the US each year. Rotting food, that sits in our landfills, releases a toxic green house gas emission called methane. By composting our food scraps not only will you avoid creating additional methane but you can use the finished "black gold" for your garden or indoor plants!