Desalination & Membrane Water Treatment Equipment worked example

Membrane Flux Rate at 99% target flux attainment: a worked example

What does the result look like when target flux attainment reaches 99%? The full calculation is worked below with real intermediate numbers. Use it when membrane flux rate in desalination and membrane water treatment equipment needs a clean rate and gap-to-target you can put on a tier board.

The inputs for this scenario

  • Actual normalized membrane flux: 8 LMH or GFD (unchanged)
  • Design or rated membrane flux: 250 LMH or GFD (unchanged)
  • Target flux attainment: 99 % (raised for this scenario; the documented default is 95)

Working through the calculation

  • Applying the documented formula (Membrane flux attainment = actual normalized membrane flux ÷ design or target membrane flux × 100) to the inputs above produces each figure below.
  • At this operating point the engine returns 3.2 % for membrane flux attainment, the number this scenario is built around.
  • At this operating point the engine returns 95.8 points for flux attainment gap to target.
  • At this operating point the engine returns 8 count for actual normalized membrane flux.
  • At this operating point the engine returns 250 count for design or target membrane flux.

How this compares with the baseline

  • Against the tool's baseline example, where target flux attainment sits at 95% and the headline result is 3.2 %, this scenario lands almost exactly on the baseline at 3.2 %.
  • A figure at this level is achievable when target flux attainment is genuinely sustained, not just peaked for a shift. It is a ratio, not a normalization model — you must already have temperature- and pressure-corrected (normalized) flux as the input, or the percentage will mislead you.

Results at a glance

  • Membrane flux attainment: 3.2 % (headline result)
  • Flux attainment gap to target: 95.8 points
  • Actual normalized membrane flux: 8 count
  • Design or target membrane flux: 250 count

Run it with your numbers

  • Every input above is editable in the live Membrane Flux Rate calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.