However, boiling concentrates inorganic impurities such as nitrate and sulfates. Boiled water also tastes flat because the carbon dioxide is removed. Filtration Filter systems are a relatively simple and effective way to control a variety of contaminants. These include mechanical filters, activated carbon filters, oxidizing filters and neutralizing filters. They do not remove dissolved or very fine particles and are often used in combination with other treatment equipment.
Filters are commonly of fabric, fiber, ceramic or other screening material.
Mechanical filters can be cartridge units, mounted in a single waterline or on a tap, or tank units, which treat an entire household water supply. The filters must be serviced periodically. They are generally used to eliminate undesirable odors and tastes, organic compounds and remove residual chlorine. Most inorganic chemicals, metals, microorganisms and nitrate are not removed by the filters. Activated Carbon Filtration System Carbon filters also remove some potentially hazardous contaminants such as radon gas, many dissolved organic chemicals and trihalomethanes.