14 Germany’s biggest ultrafiltrati- on plant is operated by WAG Nordeifel in Roetgen. Following extensive testing, the company decided to construct a new UF plant as a prefiltering stage. The reservoir water is now treated in two stages. The first stage separates out bacteria, viruses and micro- organisms. The filtered water then passes through the second stage for deacidifying, hardening and reduction of manganese. A further UF membrane stage

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