Environmental Science
There are no holes in a reverse osmosis membrane. It is not a filter, and that explains almost everything about it
23 Sept 2026 · 12 min read
The active layer of an RO membrane is a dense polymer film about a hundred nanometres thick with no permanent pores at all. Water dissolves into it and diffuses through. Once that is clear, the wasted reject water, the energy bill and the limits of every 'new membrane' headline all follow.
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