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What you won’t find in mains water – but may find in your well BACTERIA Bacteria are a fairly common problem in well water, mainly coliform bacteria, enterococci and E. coli. They reach the well with groundwater – through runoff from fields fertilised with manure or slurry or, more often, through seepage from old cesspits, which are still common in rural areas. Bacteria are very often accompanied by nitrates, nitrites or ammonium ions, which point to the same source of pollution: a cesspit...

REVERSE OSMOSIS Reverse osmosis is a technology that uses a special membrane to remove fine particles, bacteria, viruses and microplastics from water, as well as much smaller particles such as pesticide molecules, heavy metal salts and even calcium, magnesium and sodium salts. The result is very pure water, free of almost all impurities and minerals. At the heart of reverse osmosis is a membrane with extremely small pores, in the order of 0.0001 microns (one ten-millionth of a millimetre). Onl...