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Frequently asked questions

They give the membrane element size in inches. A 4040 is 4 inches in diameter and 40 inches long, a 4021 is 4 inches by 21 inches, and a 2521 is 2.5 inches by 21 inches. The 1812 thin film membranes are the smaller 1.8 inch by 12 inch size and are rated by output in gpd.

Low energy (Axeon HF4), ultra low energy (Axeon HF5) and low pressure (Spectrum Premier PRO) membranes are designed to run at lower feed pressures, which can reduce pumping energy. The Spectrum SRO is the standard high rejection option for when rejection matters most. Choose according to your feed water and operating pressure.

Common signs are rising conductivity or TDS in the permeate, falling permeate flow, or a rising pressure drop across the membrane. Compare these against your commissioning figures, because fouling and scaling often show up here before water quality becomes a problem.

Standard sizes such as 4040 are usually dimensionally interchangeable between brands, but flow, rejection and operating pressure differ. Check your system's design specification before changing, or contact us with your system details.