What We Remove
When you’re looking for a drinking water filter, what is it that matters to you? Are you looking for a water filter based on its size, shape, or color? Or are you looking for a water filter based on how well it performs, how convenient it is to use, and what contaminants it removes from your water?
A drinking water filter is nothing without the performance to back it up. Bells and whistles won’t protect you from harmful contaminants in your water. Flashy lights won’t improve the quality of the water you drink, wash foods with, and cook with. Slick marketing won’t ensure the safety of the water you use for your home and family.
At Multipure, we pride ourselves in our products’ NSF-certified ability to treat the broadest range of potential drinking water contaminants. Contaminants that make your water murky, or that make your water smell and taste bad. Contaminants that can cause serious illness. Contaminants that are outright deadly.
Our drinking water systems work so well because our solid carbon block filters use multiple types of filtration action to remove the contaminants in your water.
Contaminants Treated Through Mechanical Filtration
Contaminants physically trapped by the pores of the filterOne of the oldest and most effective methods to filter something out of water is to physically trap the particles as the water passes through. Think of the way a fishing net catches fish while allowing water to pass through. In the same way, the tiny pores and microscopic crevices in the solid carbon block trap contaminants while still allowing the water to move through the filter.
Contaminants removed through mechanical filtration include:
- asbestos – mineral once used in building insulation; known to cause cancer
- cysts – parasitic microorganisms such as giardia or cryptosporidium, often too large to pass through the smallest pores of the filter
- particulates – miscellaneous physical particles that can cause turbidity (general water cloudiness), such as dirt or dust
Contaminants Treated Through Physisorption
Contaminants adsorbed to the filter by surface/capillary energyPhysical adsorption, or physisorption, is the process by which a particle becomes attracted to a surface, “sticking” to that surface upon contact. As water flows into the filter, some of the contaminants in the water enter the tiny pores of the carbon block and become “stuck” to the surface by a physical force known as Van der Waals forces, or capillary energy. If mechanical filtration is like a fishing net, physisorption is like a spiderweb, trapping insects that land on it.
Contaminants removed through physisorption include:
- Bisphenol A (BPA) – used in the production of plastics
- DEET – used as a pest repellent
Contaminants Treated through Chemisorption
Contaminants adsorbed to the filter by chemical forcesChemical adsorption, or chemisorption, occurs due to the nature of activated carbon; activated carbon block surfaces contain a mixture of positive and negative charges.. Metallic contaminants in the water contain positive or negative charges, and are attracted to their opposite charges in the carbon block. If mechanical filtration is a fishing net, and physisorption is a spiderweb, then chemisorption is a magnet, attracting metallic particles to itself.
Contaminants removed through chemisorption include:
- Lead – metal; known neurotoxin that can poison the blood, nervous system, and brain
- Mercury – metal; known neurotoxin that can poison the blood, nervous system, and brain
Contaminants Treated Through Catalysis
Contaminants rendered harmless through catalytic reactionCatalysis is what happens when a contaminant is adsorbed to the filter surface and in the process experiences a chemical change. When this happens, the contaminant changes from something harmful into relatively harmless chemical compounds. Think of catalysis like adding something to make a substance less dangerous – like diluting something really acidic by watering it down.
Contaminants reduced by catalysis include:
- Chloramine – used as a disinfectant
- Chlorine – used as a disinfectant
Detailed Contaminant Reduction List
Multipure Drinking Water Systems are NSF certified for NSF 42 (Aesthetic Effects), NSF 53 (Health Effects), and NSF 401 for the reduction of:
- Arsenic V*
- Bisphenol A
- Cyst (Giardia, Cryptosporidium, Entamoeba, Toxoplasma)
- Nonyl phenol
- Particulate matter, Class I (0.5 micron)
- Perflourooctanoic acid (PFOA)*
- Perfluorooctane sulfonate (PFOS)*
- Volatile Organic Chemicals (listed below):
- Carbon Tetrachloride
- 2,4-D (Dichlorophenoxyacetic acid)
- 1,2 Dichloropropane
- Ethylene Dibromide (EDB)
- Haloacetonitriles (HAN):
- Haloketones (HK):
- Heptachlor Epoxide
- Perflourooctanoic acid (PFOA)***
- Perfluorooctane sulfonate (PFOS)***
- 2,4,5-TP (Silvex)
- Tribromoacetic acid
- Trihalomethanes (TTHM):
- Chloroform (surrogate chemical)
- Xylenes (total)