More About How the Multi-Pure® Solid Carbon Filter Works

Multi-Pure® Drinking Water Systems, featuring Multi-Pure’s unique Solid Carbon Block filter technology, are designed to provide superior performance, health safety, and convenience. The replaceable filter cartridge combines three different approaches to filtration to produce the most effective water filter with proven performance. Multi-Pure utilizes only the highest quality, FDA-approved food-grade materials that are formulated to provide the cleanest, freshest drinking water without removing healthy, naturally occurring minerals.

Multi-Pure® Solid 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 electrokinetically adsorb charged colloidal particles too small for removal by mechanical straining. The pre-filter media combines the technology of mechanical straining, for the removal and retention of solid and semi-solid contaminants that can cause premature clogging, with electrokinetic adsorption for the reduction of colloidal contaminants down to the submicron (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 submicron size, including cysts. The highly compacted carbon block filter media is a blend of selected activated carbons and other materials that reduce inorganic as well as organic compounds. Only coconut shell-based carbons, a renewable natural resource, are selected for their far greater surface area and high retentivity characteristics. For select Multi-Pure® Solid Carbon Block filters, the filter formulation includes a specially developed arsenic adsorbtive media that is blended with the carbon media specifically to reduce Arsenic V.

The materials are formed into a compressed 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® Solid Carbon Block filter, the water contact time is longer and provides for greater adsorption of many different chemicals, pesticides, herbicides, and certain heavy metals. The Multi-Pure® 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 can become incubators of bacteria, the densely compacted Multi-Pure® Solid Carbon Block filter eliminates this health problem because there is no room for bacteria 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 cartridge 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 are not applicable to contaminants reduced by mechanical filtration because of broad variations in the quality and quantity of physical matter in the drinking water. The Solid 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) the filter’s rated capacity is reached; (b) the flow rate diminishes; (c) the filter becomes saturated with bad tastes and odors; or (d) annually.

The effectiveness of any drinking water treatment device is measured by the performance of its underlying filter. Multi-Pure submits all of its Multi-Pure-branded products to NSF International for rigorous testing and certification against the applicable NSF/ANSI Standards. For Point Of Use Drinking Water Treatment devices such as the ones Multi-Pure manufactures, the applicable Standards are NSF/ANSI Standards 42 (Aesthetic Effects) and 53 (Health Effects). Multi-Pure has proven through independent testing and certification that its products are the most effective water filters available in the market, reducing the widest range of contaminants of health concern.