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Silver Series II membrane disc diffusers

Overview Specifications Industries & Applications Documentation & Tools


Product Features
  • Ideal for air-on/air-off applications such as SBRs, aerobic digesters, and anoxic swing zones, as well as continuous operation
  • Over 22 million diffusers installed in municipal and industrial applications worldwide
  • Higher sustained efficiencies verified through 3rd party testing
  • Advanced membrane perforation technique creates extremely fine, uniform bubble pattern for optimal oxygen transfer
  • Low maintenance and long service life of 10+ years

Delivering years of proven performance

Xylem's Sanitaire Silver Series II membrane disc diffusers feature a unique split pattern and slit shapes, which disperse air bubbles in an extremely fine and uniform pattern for high oxygen transfer efficiency. The specially-blended, high grade EPDM elastomer compounds resist degradation that’s common to other membranes, and delivers over 10 years of proven performance.

Lower energy consumption and raised operating efficiencies are made possible by the unique membrane shape, integrated O-ring, and top-sealing threaded retainer ring, which eliminates leakage.  A highly effective, integrated check valve enables the aeration zones to be easily shut down for air-on/air-off applications.

Sanitaire patented pipe joints are designed to withstand thermal expansion and contraction, water hammer and other dynamic stresses, while pipe supports allow infinite height adjustment for accurate grid leveling. Spline joint design makes it easy to install and eliminates the risk for installation  errors for contractors. Piping and other elements of the Silver Series II system are fully interchangeable with Sanitaire ceramic disc systems.



General Information
Silver Series II membrane disc diffusers
Conventional Activated Sludge, MBR, SBR, Oxidation Ditches, Channel Aeration
Air on / air off operation
Shop oxygen transfer test
Performance warranties
Fixed to floor systems
Retrievable (liftable) design available
System Components
Silver Series II membrane disc diffusers
304 SS, 316 SS
Distribution header
304 SS, 316 SS
Liquid purge system
Manual or Automatic Available
Disc diffusers
Controls (optional)
OSCAR process performance optimizer
Blowers (optional)
Positive displacement or centrifugal
SaniClean liquid cleaning system (optional)
Safe diffuser DWP recovery system
Diffuser Properties
Silver Series II membrane disc diffusers
Diffuser types (mm)
Saddle and Screw-on - 178 mm and 229mm
Diffuser types (inches)
Saddle and Screw-on - 7" and 9"
Typical operating air flow range per diffuser
0.5 scfm to 7 scfm (0.8 Nm3/h to 10 Nm3/h)
Typical standard oxygen transfer efficiency (SOTE)
6-8% per m submergence (2-2.5% per ft submergence)
Typical standard aeration efficiency
2.5-6 kg O2 / kWh (5-12 lb O2 / hph)
Special features
Membrane slit pattern that improves oxygen transfer efficiency
Integrated check-valve
Diffuser membrane material
Proprietary Sanitaire Blend EPDM
Diffuser holder material
uPVC and Polypropelene
Effective surface area
7" = 0.26 ft2 (0.024 m2) , 9" = 0.41 ft2 (0.038 m2)
Orifice size
5.3mm or 6.1mm
Industries & Applications

Industries & Applications

Recommended Industries and Applications

Wastewater Systems
Building Systems Wastewater Systems
Primary Treatment
Wastewater Primary Treatment
Documentation & Tools

Documentation & Tools