Water filter with the use of ultra violet light (UV) does the tricks
Water filter using ultraviolet water purification lamps produce "germicidal ultraviolet" radiation of much greater intensity than sunlight.
Ultraviolet purification is probably the cheapest and efficient technology available to eliminate a wide range of biological contaminants from the tap water supply.
This water purifier system are combined with carbon filtration for home units, has an effectiveness of over 90% killing microorganisms such as bacteria, viruses, molds, algae, yeast, and oocysts like cryptosporidium and giardia.
UV water treatment offers excellent advantages over other forms of water purifier for microbiological contaminants.
Water filtration using ultraviolet has no chemicals to the the drinking water, it produces no bi-products, and it does not alter the taste, pH, or other properties of the water.
Untreated water contains bacteria and viruses which are the main causes of most major waterborne pathogenic diseases.
UV treatment of water totally kills viruses like: enteric, hepatitis and Legionella pneumophila
Counter top UV purifiers are highly recommended for eliminating,
* E-coli,
* Salmonella typhl (Typhoid fever),
* Salmonella enteritidis (Gastroenteritis),
* Vibrio cholerae (Cholera),
* Mycobacetrium Tuberculosis (Tuberculosis),
* Legionella pneumophila (Legionnaires' Disease),
* Influenza Virus,
* Polio virus, and
* Hepatitus A Virus
A personal thought for you to run by: Magnetic water softener together with counter-top three-in-one water treatment unit should work