The traditional pretreatment for Reverse Osmosis (RO) feed water is softening in collaboration with Active Carbon Filtration (ACF). However, this combination is not optimal if the site has problematic mineral species or periodic high microbiological levels. The pretreatment with an Electrolytic Scale Reducer (ESR) and Hydro Optic De-Chlorination (HOD) has no need for regeneration, no organic media and no chemicals. This new system operates reliably and robustly, with low maintenance, without waste water and with low life cycle costs. This article covers the historical references, the status quo of Water for Injection (WFI) production and the traditional designs. Moreover, the new technologies ESR and HOD are explained to the reader.

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