Practice good engineering hygiene by keeping your Carcoon as clean as possible both inside and outside. To clean the Carcoon use warm soapy water and dry with a clean towel material. Primary and secondary filters may be occasionally washed in warm soapy water, squeezed dry and refitted. Service life of these reticulated foam filters largely depends on ambient conditions however its good practice to replace these filters after two years or so of continual use.