Low pH or acidic water can cause corrosion of copper pipe fittings. In extreme cases the copper the water dissolves from pipework can react with soaps causing water to turn blue and with hair dyes giving unpredictable results, e.g. blondes go green.
The CleanStream® filter uses a media in the filter which corrects the acidic nature of water without the need for mixing or dosing of chemicals. The media slowly reacts with water and the filter media is topped up, usually once a year