Point of Use (POU) Devices

POU (Point of Use) devices have become quite common for household use. One type is drinking water pitchers that employ a gravity drain cartridge system to treat tap water. The cartridge may contain a particulate filter, media impregnated pleated filter, or one or more types of purification media. The media include: carbon, weakly acidic cation exchange resins, and strongly acidic cation and strongly basic anion exchange resins blended as a mixed bed. Various combinations of the media are often used. Carbons reduce organics and chlorine, as well as some tastes and odors. Weakly acidic cation exchange resins reduce hardness. Mixed bed ion exchange resins demineralize the water (Total Dissolved Solids, TDS reduction). Most cartridges can also remove some heavy metals, including lead. Additionally, some remove PFAS (perfluoroalkyl and polyfluoroalkyl substances), depending upon the specific media used. Most cartridges improve taste & odor, chlorine, and metallic and other impurities. All cartridges provide a list of the contaminants certified to be removed, and cartridges are typically replaced after treating a recommended volume of water.

Graver Technologies provides the ion exchange resin products used in pitcher cartridges to produce the water purity suitable for consumption. These product offerings are the result of long-term experience producing ultra-high purity products for demanding applications such as condensate polishing, nuclear reactor water purification, and ultra-pure water products. GT is able to process and prepare large quantities of the products to supply the high volume needs for consumer POU device applications.

Read More

What are Heavy Metals?

Heavy metals are naturally occurring elements with high atomic weights and densities, typically greater than 5 g/cm³. They include lead, mercury, arsenic, and cadmium. They can be toxic even in trace amounts, accumulating in organisms and causing health risks.

What are the Problems with Heavy Metals in Water?

Heavy metals in water can cause severe health effects such as neurological damage, kidney failure, and cancer, even at low concentrations. They persist in ecosystems, bioaccumulate in the food chain, and disrupt aquatic life.

What are the Heavy Metal Parameters for Water?

Heavy metal parameters include concentration levels, toxicity thresholds, bioavailability, and the presence of specific metals like Pb, Cd, Hg, and Cr. These are regulated by agencies like the EPA and WHO to ensure water safety.

How do you Calculate Heavy Metal Concentration in Water?

Heavy metal concentration in water is measured using techniques like atomic absorption spectrometry (AAS), inductively coupled plasma mass spectrometry (ICP-MS), or colorimetric analysis. The results are expressed in micrograms per liter (µg/L) or milligrams per liter (mg/L).

What is the Permissible Limit of Heavy Metals in Water?

The permissible limits vary by a regulatory body, but for drinking water, the WHO and EPA set limits such as Lead (Pb) ≤ 0.01 mg/L, Mercury (Hg) ≤ 0.001 mg/L, and Cadmium (Cd) ≤ 0.003 mg/L.

What is the Mechanism of Heavy Metal Adsorption?

Heavy metal adsorption involves ion exchange, surface complexation, and precipitation on adsorbent materials like activated carbon, biochar, or nanomaterials, reducing metal ions from contaminated water. Adsorption efficiency depends on pH, temperature, and adsorbent type.

Contact Us

If you have questions or comments regarding the information in this site, or if you wish to receive additional information on Graver Technologies, please contact us:

Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.

Need help?

You can find the right application or product using our Tool, or through our Chat Bot.

Keep In Touch

Keep up to date with our latest news and announcements. Unsubscribe anytime.

Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.