Which of the following statements is false about filtration systems?

The statement that "filters can remove all contaminants" is false because no filtration system can guarantee the complete removal of all types of contaminants from water. While filters are effective in removing a wide range of particles, bacteria, and some chemicals, many contaminants, especially dissolved substances like certain heavy metals or pharmaceuticals, may not be fully captured by standard filtration methods. This limitation emphasizes the importance of selecting appropriate filtration technologies based on the specific contaminants present in the water source.

In contrast, the other statements highlight the essential benefits of filtration systems. The critical role of filtration in ensuring public health underscores its importance in reducing pathogens and harmful substances. Good design is vital for performance because a well-designed filtration system ensures optimal flow and contact time, maximizing contaminant removal. Finally, adequate filtration directly correlates with improved water quality, making it safer for consumption and use.