In the water softening process, the resin with positively charged sodium ions will capture the scale-forming positively charged calcium and magnesium ions in water and release the sodium ions to the water for exchange.
While for the deionization process, it can either exchange positively charged ions (cations) or negatively charged ions (anions).
In the anion exchange process, the negatively charged ions in water like fluoride, arsenic, nitrate, uranium, sulfate, and more get removed and exchanged with other desirable negatively charged ions like chloride (CI‾).
And when the ion-exchange resin capacity is fully used up, it will be undergoing a process called regeneration to restore the initial condition in the IX resin using regenerant like sodium chloride solution and hydrochloric acid.
The water softening and deionization is often used in water filtration system at home together with other filtration technologies like Reverse Osmosis (RO) and Activated Carbon.
The ion exchange process is effective in removing dissolved inorganic contaminants but weak against organic contaminants and microorganisms.
The Advantages of Ion-Exchange Method:
- Effective against dissolved inorganics contaminants
- Able to remove arsenic, fluoride, nitrates, sulfates, uranium, and more negatively charged contaminants
- Able to remove manganese, iron, chromium, magnesium, calcium, and more positively charged contaminants
- Regenerable for continuous usage
The Disadvantages of Ion Exchange Method:
- Cannot remove sediments, organic contaminants, and microorganisms
- The Ion-Exchange (IX) resin is vulnerable to bacterial growth
- High operating cost
Pursafet ‘s coffee machine water filters are with none sodium ion-exchange resin and coconut shell activated carbon granular filter media, which could help to reduce chlorine, taste , odor, prevent limscale to build-up to extend the coffee machine life.
Please check https://pursafet.com/catalogue/coffee-machine-water-filter/ for details.