Whole house Water filtration systems whole House also known as point-of-entry (POE) systems, are installed at the main water line entering the home. This strategic placement ensures that every drop of water distributed throughout the house—whether it’s from the kitchen tap, the shower, or the laundry room—is treated and purified before use. These systems vary in complexity and size, designed to remove a wide range of contaminants, including sediment, chlorine, heavy metals, and organic compounds, depending on the specific filtration technology used.