Are there supplies that must be changed with SoClean?
Yes, the filter and check valve should be replaced every 6 months. The machine will notify you when it is time for a replacement. The filter and check valve come together in a kit and can be purchased here, https://aerocareusa.com/products/soclean-2-cartridge-filter-kit?_pos=2&_sid=114349b1c&_ss=r