The water filtration technology they should install in their house is reverse osmosis because it requires low maintenance, and removes all contaminants such as bacteria and chemicals​.
Reverse Osmosis Systems have a totally excessive effectiveness in doing away with bacteria (for example, Campylobacter, Salmonella, Shigella, E. coli); Reverse Osmosis Systems have a totally excessive effectiveness in doing away with viruses (for example, Enteric, Hepatitis A, Norovirus, Rotavirus).
Reverse osmosis works through shifting water via a semipermeable membrane to filter and flush away any contaminants. Reverse osmosis structures are quality appropriate for home use and offer a surprisingly green manner to purify your ingesting water at home.
Thus it is well explained.
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