The course covers proactive cleaning, descaling, disinfection, safety and quality requirements for vacuum toilets and associated sanitary components, specifically for Stadler FLIRT DMU equipment. Content covers definitions (preventive maintenance = planned maintenance to prevent failure; vacuum toilet = vacuum toilet system for the transfer and storage of waste; intermediate storage tank = temporary container/separator for waste; scale = mineral deposit, removed with acid-based substances, e.g. 10% citric acid; disinfection = microbiological risk reduction; PPE = personal protection against sewage and infection risks; manufacturer's maintenance instructions such as SEMVAC = binding work instructions). The course also covers requirements and standards (e.g. EN 15380-2, EN 13306), the right tools and chemicals (high-pressure cleaner, acid-based descalers, disinfectants), documentation, deviation procedures and an example of a maintenance interval (160 days). The aim is to provide clear, binding practices for safe and standardised maintenance and cleaning.