KDF & Redox Water Filter Treatment Process Details
KDF Water Filters - Redox
Manufacturers, hospitals, beverage manufacturers, restaurants, municipal water treatment facilities, consumers, and others rely on KDF process media to safely reduce or remove chlorine, hydrogen sulfide (rotten egg sulfur smell), heavy metals, and bacteria from water.
When used alone, KDF media can remove more than 95% of chlorine, iron, heavy metals, hydrogen sulfide, and other contaminants from water.
Compared to other water treatment technologies, KDF process media offers reduced material requirements resulting in more compact and more economical systems. KDF process media also last longer than GAC (granular activated carbon), which means material replacement requirements are lower.
Because KDF process media contain no chemical additives and are 100% recyclable, costly disposal requirements are eliminated. What's more, KDF process media are safer for the environment.
Household water treatment
Both point-of-entry and point-of-use applications use KDF media to remove chlorine, lead, bacteria, iron, other heavy metals, and a variety of other impurities. For whole-house water systems, KDF media remove chlorine and other impurities from the water supply at the point-of-entry.
For chlorine removal in point-of-use applications, KDF media is incorporated into shower filters and into cartridges at the tap. KDF media are also used in water treatment systems in recreational vehicles.
KDF medium delivers 10 times greater filter life than GAC
KDF Medium GAC
In a controlled test under normal operating conditions, KDF process media delivered a filter life 10 times longer than GAC in chlorine removal service.
Water treatment costs with KDF medium are less than half that of GAC
KDF Medium GAC
In the same test, after treating two million gallons of water, chlorine removal cost is 50% lower with KDF process media.
Contaminants removed by KDF process media
KDF process media remove many of the most common impurities found in water supplies.
KDF medium can remove up to 99% of free chlorine.
KDF medium can also be used to replace GAC entirely. Because KDF medium provides more efficient chlorine removal, you benefit from a more cost effective water treatment system. Chlorine removal costs can be reduced 50% or more with KDF medium.
Iron (Fe+2) or ferrous iron in groundwater can impart objectionable taste and color to potable water and can severely stain household fixtures. KDF process media removes iron from water used at the point-of-entry.
KDF medium removes more than 90% of iron from groundwater supplies. What's more, compared to the alternatives, KDF medium costs less, with higher flow rates and reduced medium requirements, as shown in the table below.
Hydrogen sulfide removal
Hydrogen sulfide (H2S) is a highly corrosive gas formed in groundwater when bacteria decompose vegetation and other organic matter. H2S removal with KDF process media is both safe and economical.
KDF medium eliminates H2S by reducing the hydrogen sulfide gas to cupric sulfide, an inert, harmless precipitant. KDF medium then filters the precipitant from the water.
In contrast, aeration towers and degasification systems are expensive H2S removal options. Using chlorine to oxidize H2S can leave trihalomethane levels exceeding U.S. Environmental Protection Agency (EPA) limits.
One-third as much KDF medium provides three times the effective flow rate of other filter media in iron removal service.
|Flow Rate||15 gpm/sq.ft.||5 gpm/sq.ft.||5 gpm/sq.ft.||20-30 gpm/sq.ft.|
|Amount of Medium
|1/3 cu.ft.||1 cu.ft.||1 cu.ft.||1 cu.ft.|
Heavy metals removal
Heavy metals in drinking water are a significant health threat. KDF media can remove up to 98% of water-soluble lead, mercury, nickel, chromium, and other dissolved metals. KDF media can be used alone, or to protect existing water purification technologies to treat groundwater supplies containing water-soluble heavy metals or to remove heavy metals from process water before it is discharged.
KDF media control the build-up of bacteria, algae and fungi in GAC beds, carbon block filters, and in-line carbon filters.
By eliminating these microorganisms, KDF media significantly extend the life of the carbon, as well as protect downstream RO membranes and ion exchange resins from fouling.
KDF media also control scale, algae, and bacteria.
Using KDF media to reduce the build-up of bacteria and other microorganisms eliminates the need for chemical treatment methods which are both costly and harmful to the environment.
Microorganisms, however, are controlled two ways: First, the exchange of electrons in the Redox reaction creates an electrolytic field that most microorganisms can't survive. Second, KDF process media can cause hydroxyl radicals and peroxides to form from some water molecules. The hydroxide radicals and peroxides interfere with microorganisms' ability to function.
Municipal water treatment
Many municipalities rely on the exceptional performance of KDF media to remove chlorine and other impurities from feed water entering public utilities, schools, and businesses.
KDF media are also cost-effective alternatives to green sand and other filtration methods traditionally used to remove iron from municipal water supplies.
Commercial water treatment
Water treatment systems serving commercial facilities such as hotels and restaurants use KDF process media to remove chlorine. These facilities benefit from better tasting water with less odor, as well as less wear on towels, bedding, napkins and other items that are laundered frequently on-site.
Process water treatment
KDF media remove chlorine and help control bacteria and scale build-up in large-scale industrial water treatment facilities serving cooling towers, food and beverage plants, and industrial laundry facilities.
Medical water treatment
For medical labs and dialysis centers where water purity is crucial, KDF media provide exceptional water purification. KDF media also remove mercury and other water-soluble heavy metals from feed water entering hospitals and from wastewater prior to discharge to public water treatment systems.
Redox action is the science behind KDF process media
KDF process media are high-purity, copper-zinc formulations that reduce contaminants in water using an oxidation/reduction (Redox) reaction.
In other words, KDF media exchange electrons with contaminants, changing them into harmless components. For example, chlorine is changed into water-soluble chloride, soluble ferrous cations are changed into insoluble ferric hydroxide, and hydrogen sulfide is changed into insoluble copper sulfide.
Typical Redox reactions
zinc chloride chlorine
Harmful chlorine is removed by changing free chlorine into hydroxide-soluble chloride ions.
KDF process media act as catalysts to change soluble ferrous cations into insoluble ferric hydroxide.
Other heavy metals such as mercury, copper, and nickel are removed simply by bonding to the KDF media.
- KDF Water Replacement Filter With KDF 55 Redox Media # AF-10-2025Learn More
KDF Water Filter With KDF 55 Redox Media #AF-10-2025. Standard Size Replacement Filter Cartridge 10" X 2 3/4". For slimline and standard size housings. Excellent for chlorine and heavy metals reduction. Effective to treat for sulfur & iron. KDF media also controls scale, algae, and bacteria. 12 per case, sold individually. Order a case and save even more.
- Goes Green 88 Shower Soft Water FilterGoes Green Shower Soft Water Filter - Top Of The Line Shower Filter with Replaceable KDF Cartridge. Uses 300 grams of pure KDF.KDF is far superior at removing chlorine than carbon in the shower. Installs easily between existing shower head and pipe. Help's enhance hair's pH balance, softens hair and skin. Helps preserve hair color. Prevents bacterial growth. For hot water in the shower, KDF is "hands down" the best filtration media available. Good for one year or 30,000 gallons, which ever comes first. Shower Head not included. Order 2 or more and save even more!Learn More
- Everpure ® KDF XK Plus Water Filter Cartridge # 9612-91Everpure ® KDF XK Plus Water Filter Cartridge # 9612-91 • High capacity 1/2 micron precoat filter contains KDF for solving slime and scale problems. • Provides all the benefits of precoat filters, including dirt, bad taste and odor, chlorine, asbestos and cyst reduction. • KDF controls microbial build-up, slime and scale. • Sanitary quick change cartridge is easy to install and replace. • Capacity: 12,000 gallons (45,420 L) • Flow Rate: 1.67 GPM • Certifications: NSF 42, NSF 53, WQA Gold SealLearn More
- Everpure ® KDF 7K Water Filter Cartridge # 9612-81Everpure ® KDF 7K Water Filter Cartridge # 9612-81 • 1/2 micron precoat filter contains KDF for solving slime and scale problems. • Provides all the benefits of precoat filters, including dirt, bad taste and odor, chlorine, asbestos and cyst reduction. • KDF controls microbial build-up, slime and scale. • Sanitary quick change cartridge is easy to install and replace. • Capacity: 9,000 gallons (34,065 L) • Flow Rate: 1.67 GPM • Certifications: NSF 42, NSF 53, WQA Gold SealLearn More