Usage Information: The SoClean 3 CPAP Sanitizer Filter must be replaced every 6 months with normal usage. The "Filter Issue" icon, a diagram of the filter with an X on it, will flash amber on the SoClean's control panel starting about 1 month before the filter must be replaced. If the filter replacement warning expires and turns solid amber, before the filter is replaced, the SoClean 3 will cease to operate until the filter is replaced.