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Membrane technology for the food & beverage industry requires microfiltration and special attention to hygienic design. X-Flow’s S14 microfiltration modules were developed for the removal of yeast cells, protein complexes and other turbidities from liquids such as beer, wine, cider and milk. These modules, featuring high mechanical strength and high resistance to chemicals, are operated in cross-flow mode. Based on hydrophilic hollow-fiber MF membranes, with a pore size in the range of 0.4 – 0.8 µm, the S14 modules are composed of a PES/PVP blend for the membranes, a PSF filter housing and an epoxy potting.



The S14 holds 1.5mm hollow fiber microfiltration membranes.


  • High permeability
  • Chemical resistance with a wide pH range (2 – 13) and high chlorine stability for cleaning and regeneration
  • Meets turbidity and yeast count specifications for beer, wine and cider
  • Allows for high concentrations of yeast in feed stream
  • Excellent backflush possibilities

Functional Description

The S-14 membrane modules

S-14 modules are usually racked in a skid (standard unit) of 18 modules. The permeate flow ranges between 400-800 liter per hour per module, which amounts to 7.5-15 m3 per hour per skid. The mode of operation is typically batch-wise, but continuous operation by alternation between two sets, or cascade systems, are also possible.

Click here to learn more about the S-14 configuration.

Pentair X-Flow Crossflow Beer

Fields of application

Beer production
The S-14 module delivers superior filtration performance and is the best possible alternative to filtration with diatomaceous earth (DE, traditionally kieselguhr) in breweries. This membrane technology simplifies the process, makes the handling of DE redundant, and strongly reduces the solid waste stream. Above all, beer quality is better and constant; especially beer taste and retention of beer spoiling bacteria.

Cider production
In the production of cider, the S-14 membranes finds the same application as in beer brewing, with the same benefits.

The module could be applied in wine and milk as well, or other liquids like filtration of enzymes and sugar.



Membrane surface area
9.8 m²
Module dimensions (dxl)
approx. 200 mm x 1172 mm
Housing material
Membrane material
Hydraulic membrane diameter
1.5 mm
Nominal pore size
0.6 µm
Chlorine resistance
250,000ppm hours @ pH ≥11
Datasheet S-14
Datasheet S-14
Connection configurations: to learn more about other X-Flow membrane modules and their connection configurations, please click here.
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