Nanofiltration & Reverse Osmosis

Advanced Reverse Osmosis Technology

Nanofiltration - Similar to reverse osmosis but are not as effective at removing dissolved solids. Nanofilters are commonly referred to as membrane softeners because they will usually reject the double-positively charged hardness ions (i.e., calcium & magnesium) fairly well but cannot reject the single-positive charged soft ions (e.g., sodium & potassium).

Nanofilters are most commonly used in the drinking water industry where the dissolved solids must be reduced to below 500 mg/L (Safe Drinking Water Act). The choice between nanofiltration in these applications comes down to economics. Nanofilters require less pumping pressure but would require a greater percentage of the total flow compared to RO systems which require greater feed water pressure but could be blended with the raw water due to the lower TDS level of the RO permeate.

For further information or assistance please contact Reverse Osmosis Chemicals International on +44 (0) 161 877 2334 or e-mail info@rochemicals.com.