Modern cartridge filters consist of a special fleece with millions of very small passages. The dirt gets caught in these diffusers and is thus retained. In the event of improper cleaning, bacteria accumulate in the fleece and form a biofilm that protects it. Additional fats, oils and skin flakes form the nutritional basis for the bacteria. Then the filter becomes a water polluter. Contaminated filters also cause a higher power consumption of the filter pump and shorten the service life of the filter pump.

For these reasons it is important to clean the filters regularly and thoroughly: Lotus Clean Filter Wash Natural dissolves organic soiling, grease and oils from the filter fleece. Clean the filters every two to three weeks (in the initial period with Lotus Clean a weekly cleaning may also be necessary) and use a second set of filters during the cleaning time. The filter fleece loses its filter effect over time. Even good-looking filters can then only produce poor filter performance.