The main reason for this is that the filters are installed and used on a basis of need rather than something that people want to aspire to. Presented with the cost of installation, people who do not need the filter system installed may decide not to have it installed, perhaps opting for a counter top filter jug or point of use system instead. This may also be because they have some confusion of the types of filter there are on the market or that they are unsure if they need one at all. This may also lead people to not have any water filters at all.

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