How the filter works?

MULTI-PURE SYSTEMS ARE TESTED AND CERTIFIED BY NSF INTERNATIONAL®

- NO OTHER WATER FILTER REDUCES MORE CONTAMINANTS THAN MULTI-PURE -

Multi-Pure Drinking Water Systems’ 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.

1. Mechanical Filtration: The filtration process begins with water passing through a graded density 5-micron pre-filter that traps dirt, sand, and particles that affect the taste, odor, and overall appearance of your water. Then the water passes through the highly compacted solid carbon block where direct mechanical interception of particles as small as 0.5 micron occurs. Asbestos, cysts, and turbidity are reduced through mechanical filtration at the sub-micron level.

2. Electrokinetic Adsorption: The graded density prefilter acquires a positive molecular charge as water passes through it. Since most colloidal contaminants exhibit a negative charge in solution, the media fibers will electrokinetically attract charged colloidal particles too small for removal by mechanical straining. 

4. Physical Adsorption: Multi-Pure’s highly compacted carbon block filter media is a blend of selected activated carbons and other materials that reduce aesthetic contaminants and health-related contaminants. Many carbons are selected with a high surface area and high retentivity characteristics. The materials are formed into a carbon block, which is densely compacted to provide longer contact time and outstanding performance that cannot be achieved with other filtration technologies. Multi-Pure’s carbon block filter effectively adsorbs contaminants with health significance, including chlordane, lead, mercury, MTBE, PCBs, Toxaphene, and VOCs, plus aesthetic contaminants such as chlorine and chloramine. 

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 provides the best in water filtration!

Why Multi-Pure?

Nationally recognized standards established for the drinking water treatment industry confirm that the most effective systems for the removal of both aesthetic and harmful contaminants are those that utilize solid carbon block filters.

The Multi-Pure densely compacted solid carbon block filter has the ability to micro-strain every molecule of water through microscopic pores. The large surface area allows the water to be in contact with the carbon for a longer period of time, providing greater adsorption of the many different chemicals, pesticides, herbicides and certain heavy metals. Contaminants with a physical size are removed when water passes through the pre-filter, which helps keep the carbon block from clogging prematurely.

The developer of the solid carbon block filter technology, Multi-Pure Drinking Water Systems has been a leading manufacturer in the industry since 1970 and has gained a reputation for performance and quality.

The Multi-Pure technology offers superior effectiveness in reducing contaminants of health concern, and many of its products have been tested and certified by  NSF International.® for the reduction of one of the widest range of contaminants under NSF/ANSI Standard No. 53, Health Effects. In addition to being certified under NSF/ANSI Standard No. 53, Multi-Pure's filters are certified under NSF/ANSI Standard No. 42, Aesthetic Effects.

How the Multi-Pure Arsenic 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 CBTAs/CBNAs/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 CBTAs/CBNAs/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.

Arsenic V*

Arsenic (abbreviated As) is a naturally occurring contaminant found in many ground waters. Arsenic in water has no color, taste or odor. It must be measured by a lab test. Public water utilities must have their water tested for arsenic. You can get the results from your water utility. If you have your own well, you can have the water tested.

There are two forms of arsenic: pentavalent arsenic (also called As(V), As(+5), and arsenate) and trivalent arsenic (also called As(III), As(+3), and arsenite). In well water, arsenic may be pentavalent, trivalent, or a combination of both. Special sampling procedures are needed for a lab to determine what type and how much of each type of arsenic is in the water. Check with the labs in your area to see if they can provide this type of service.

Specially formulated Carbon Block systems are very effective at removing pentavalent arsenic. A free chlorine residual will rapidly convert trivalent arsenic to pentavalent arsenic. Other water treatment chemicals such as ozone and potassium permanganate will also change trivalent arsenic to pentavalent arsenic. A combined chlorine residual (also called chloramine) may not convert all the trivalent arsenic. If you get your water from a public water utility, contact the utility to find out if free chlorine or combined chlorine is used in the water system.

The Multi-Pure MP880 and CB-As Models are designed to remove only pentavalent arsenic. It will not convert trivalent arsenic to pentavalent arsenic. The system may remove some trivalent arsenic, however, it has not been evaluated for its ability to remove trivalent arsenic. The system was tested in a laboratory to remove pentavalent arsenic. Under lab conditions, as defined in ANSI/NSF Standard 53, the system reduced 0.050 mg/L (ppm) pentavalent arsenic to 0.010 mg/L (ppm) (the U.S. EPA standard for drinking water) or less. The performance of the system may be different at your installation. Have the treated water tested for arsenic to check if the system is working properly.

* Only Multi-Pure's MP750PlusRO, MP880 and CB-As Series are certified to reduce Arsenic V.