i3 FOURSterile filter

The inline filter i3 FOUR sterile filter is used on cleaning nozzles for rinsing medical products (e.g. endoscopes) and serves towards sterile filtration of tap water. It protects immunodeficient or immunocompromised patients receiving medical treatment in oncology, transplant and intensive care units as well as neonates from infections caused by waterborne germs. It serves to prevent infections caused by bacteria such as legionella pneumophila, Pseudomonas aeruginosa or mycobacteria.


  • The i3 FOUR complies with the fundamental requirements of a medical product acc. to MDD and is validated for an application period of 50 days (7 weeks). Connection is via a quick-release adapter (3/8")
  • The filter housing material contains a bacteriostatic additive and reduces the germ count for retrograde contamination by 4 Log levels within 24 hours (as per the standard¹)
  • The i3 PES membrane used in the i3 FOUR has a nominal pore width of 0.2 µm and corresponds with the definition of sterile filtration²
  • The  i3 PES ensures great stability and a consistently high flow rate.

¹ JIS Z 2801/ISO 22196
² Guidance for Industry Sterile Drug Products Produced by Aseptic Processing — Current Good  
    Manufacturing Practice September 2004, Pharmaceutical CGMPs

 If you are interested in a quotation for our filters, please call us at +49 40 2576748-0 or send us your inquiry.

i3 FOURE Sterilfilter
Handlicher i3 FOURE Sterilfilter
i3 PES




41 mm

Height (up to adapter approach)

40 mm


30 g

Flow rates

>    5 l/min. at 1 bar
> 15 l/min. at 5 bar

Filtration performance

Up to 10.000 litres

Max. operation temperature

60° C (max. 30 min. at 70° C)

Operating pressure

max. 5 bar

Shelf life

max. 1 year


i3 PES

Housing material



Double-walled PE-foil, vacuumed

Cleaning nozzles which are recommended for installation of i3 FOUR can be obtained directly at the manufacturer RfQ-Medizintechnik GmbH & Co. KG: