Call: 603.880.4420

Contact Us

or Call (603) 880-4420
M-F 8:00-5:00
Eastern Time

Sterilizing Filters for Water Treatment

Two industries where sterilizing filtration is critical are pharmaceutical plants when the water is used for drug production; and hospitals and healthcare facilities where water is used for patient treatments or instrument cleaning and reprocessing. More information is presented below, but you can explore specific filter options in the product selection table at the bottom of this page.

The schematic below shows a complete water treatment system that can deliver multiple grades of water. The possible locations of sterilizing filters are highlighted.

  1. A- Particle Trap Filtration
  2. B- Carbon Fines Trap
  3. C- Resin Trap
  4. D- RO Prefilter
  1. E- Tank Vent Filter
  2. F- Bioburden Reduction /Sterilizing Filter (optional)
  3. G- Bioburden Reduction /Sterilizing Filter (point-of-use)

Sterilizing Filtration

Sterilizing filtration in water is usually carried out with a series of filters. The final, sterilizing filter is protected from overload by prefilters for particle removal or bioburden reduction filters. The combination of filters must remove bacteria and not adversely affect the water. The choice of filters depends on the bacteria in the water (whether tap water or highly treated water) and any other particulates that may remain in the water after any treatment.


Systems installed in biotech or pharmaceutical facilities must have their performance validated before they can be used in manufacturing processes. Critical Process Filtration will assist in the testing and analysis of the filters to validate performance and assure cost-effective filter system operation. We will provide documentation of that performance for the appropriate regulatory authorities.

Custom systems are designed for new applications and to solve challenges in existing processes. Critical Process Filtration will work with you to design, build and install a cost-effective system that delivers the results you need. Contact us or visit our custom filtration systems page for more information.

Application Summaries

Critical Process Filtration has multiple filter options for sterilizing filtration in a water steam. To read more about the ways sterilizing filtration is implemented, as well as the quality and regulatory compliance aspects of removing bacteria and other organisms from water systems in your industry, click on one of the links below. Critical Process Filtration has created some short explanations of how sterilizing filtration in water systems is one step in creating the water quality required in various industries.

Product Selection

The table below shows prefilter technology options from Critical Process Filtration with links to more detailed data on the filters.

Filter Media
Filter Grade
Disc Filter
Pore Sizes
Available (µm)
Asymmetric Polyethersulfone (PES) Membrane
PDF File
PDF File
PDF File
0.03. 0.1, 0.22, 0.45, 0.65
Highly asymmetric, hydrophilic PES membrane in a double-layer configuration for high efficiency and high flow rates
Asymmetric Polyethersulfone (PES) Membrane
PDF File
PDF File
PDF File
0.03. 0.1, 0.22, 0.45, 0.65, 1.8, 1.0, 1.2
Highly asymmetric, hydrophilic PES membrane in single- and double-layer configurations for high efficiency and high flow rates.
Nylon 6,6 Membrane
PDF File
PDF File
PDF File
0.1, 0.22, 0.45, 0.65
Designed for sterilizing filtration in point-of-use applications in pharmaceutical and medical settings

Click HERE to request a quote for your application. To estimate the number of filters you will need for your application, use our unique sizing tools.

Additional filter options are also available for special circumstances. Contact Critical Process Filtration for more information.

We can help you solve tough filtration problems. Is your water treatment system becoming fouled by contaminants in incoming water? Contact us for information on how to collect and submit a water sample for a contaminant analysis. We will identify what is in the incoming water and help you find a way to prevent it from fouling your system.

We also have some tools to help you manage the evaluation of various filter options in your system. Click on the link to access to our technical document library and learn more about how Critical Process Filtration products can improve the cost-effectiveness of your system.