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C1-vs-C2 Feed-Water Selector Home – Industrial RO Membrane Elements – Low Pressure / ULP RO Elements – C1-vs-C2 Feed-Water Selector C1-vs-C2 Feed-Water Selector Match a Blue Membrane series and model to your feed water and priority. Guidance only — confirm against the datasheet. Feed water TDS (ppm) Housing / element size 8″ (8040) 8″ high-flow (8040 PLUS) 4″ (4040) Priority Lowest energy cost Highest rejection / long life Recommended series — Suggested model: — Confirm this selection & request the datasheet C1 = energy-tuned (150 psi test basis, 99.5% rejection). C2 = high-rejection / long-life (225 psi test basis, 99.6%). ULP elements are best on feed below ~2,000 ppm TDS; above that, osmotic back-pressure erodes the low-pressure advantage.
