How the Multi-Pure® Solid Carbon Filter Works

Multi-Pure® Drinking Water Systems are designed to provide the utmost in performance, safety, and convenience. The replaceable triple-action filter has been formulated using materials that will provide the highest quality drinking water without removing the healthful, natural minerals. Multi-Pure®'s carbon block filters combine mechanical filtration, electrokinetic adsorption, and physical adsorption to provide the most effective contaminant reduction possible.

Water enters the filter through a graded density pre-filter, which acquires a positive molecular charge in a moving stream of water. Since most colloidal contaminants exhibit a negative charge in solution, the media fibers will electrokinetically adsorb charged colloidal particles too small for removal by mechanical straining.

The media combines the technology of mechanical straining, for the removal and retention of solid and semi-solid contaminants that can cause premature clogging, and electrokinetic adsorption for the reduction of colloidal contaminants down to the sub micron (0.5 micron) range. Then the water passes through the highly compacted solid carbon block filter that also is designed to mechanically filter particles down to sub micron size, including cyst.

The highly compacted solid carbon block filter media is a blend of selected activated carbons and other materials that reduce inorganics as well as organic compounds. Many carbons are selected with a high surface area and high retentivity characteristics. The formulation of the Multi-Pure® CB11As filter includes a specially developed arsenic adsorbtive media that is blended with the carbons.

The materials are formed into a carbon block, which is densely compacted to enhance the kinetics of the filter and provide performance that cannot be achieved with other filtration technologies. With the Multi-Pure® CB11As carbon block filter, the water contact time is longer and provides for greater adsorption of many different chemicals, pesticides, herbicides, certain heavy metals, and arsenic.

The solid carbon block filters are exceptionally uniform and do not channel or allow bypass as conventional granular activated carbon filters (GAC) are known to do. Unlike conventional GAC filters that become incubators of bacteria, the densely compacted Multi-Pure® filters eliminate this problem because there is no room for growth in the compressed carbon.

Finally, the water passes through a post-filter, which provides integral strength to the carbon block section and prevents material degradation of the filter. The threaded polypropylene end caps seal the carbon block and assure the integrity of the seal between the filter and the housing.

Capacity ratings apply to the chemical adsorption capabilities of the carbon and specialized media. Filter life will vary in proportion to the amount of water used and the level of impurities in the water being processed. Claims of capacity aren't applicable to contaminants reduced by mechanical filtration because of broad variations in the quality and quantity of physical matter in the drinking water.

The carbon block filter is engineered so that contaminants removed by mechanical filtration will cause the flow rate to decrease, and the filter will clog. It is recommended that the filter be replaced when the first of the following occurs: (a) annually; (b) the unit's rated capacity is reached; (c) the flow rate diminishes; (d) the filter becomes saturated with bad tastes and odors.

The effectiveness of any drinking water treatment device is measured by the performance of its filter. Multi-Pure®'s solid carbon block filters effectively treat a broad spectrum of contaminants of aesthetic as well as health concern, making it the technology of choice for consumers throughout the world.