The PhosLess filter cartridges are a two-component system that can be used to supplement any filter system and serves as biological algae protection. Phosphates, which serve as a nutrient for algae, are removed from the water by physical means and are safely accumulated and trapped. The filter cartridges can be inserted directly into the holders provided in the BioTec ScreenMatic as well as ProfiClear Classic, and can also be used in any other area with a good flow. Once the binding capacity is exhausted, the unwanted nutrients can be removed permanently from the pond ecosystem.