Puretech ASEPSYS offers world-leading thermally sanitised pure water delivery.

ASEPSYS offers world-leading thermally sanitised pure water delivery. From softened water to point of use, the ASEPSYS offers a true single source, multi-technology validated unit, for producing purified water.

Made in Britain logo

ASEPSYS systems are designed and constructed to produce purified water in full compliance with cGMP guidelines as per FDA and EMEA, EP, JP and USP requirements for pharmaceutical, laboratory and medical applications.

Purified water applications

Purified water is used as an excipient in the preparation of non-sterile products and as a starting material in the preparation of water for injection and pure steam. It is also used for rinsing purposes and in the preparation of cleaning solutions.

Purified water is used in the preparation of medicinal products where bacterial endotoxins need to be controlled, except where water for injection is required.

A choice of quality  

Engineering and manufacturing practices follow ISO 9001 procedures, ASME BPE criteria, GAMP guidelines, etc. Design and construction meets the most stringent Regulations and Codes from Europe, USA and others concerning Safety and Pressure Vessels.

To ensure the equipment meets your requirements, we work in partnership with you, a dedicated team follows your order as a unique project. We develop specific Quality Plans (DQ, IQ and OQ) and undertake factory acceptance testing (FAT) to give assurance of performance and quality.

Key Features

  • Purified water to USP, EP and JP standards
  • Automatic hot water sanitisation
  • Flexible outputs from 200 to 10,000 l/hr
  • Designed for simple upgrading of production rate
  • Provides constant monitoring of RO status and gives warning of requirement for cleaning
  • Constructed from 316L stainless steel, orbitally welded, internal surface finish 0.5 Ra for product water. Designed to ASME BPE
  • Choice of control systems
  • GAMP and 21 CFR part 11 compliant
  • Validation to regulatory and client standards
  • Minimises waste water
  • Flexible system integration with proven technologies.

Trusted technology, safely implemented

The ASEPSYS Purified Water System is designed to generate purified water in accordance with the International pharmacopoeial specifications for purified water.

The system has been designed to allow automatic hot water sanitisation of the complete unit including the pipework feeding the purified water into the storage vessel.

Key components

Softened water tank
This 316L stainless vessel is used as a reservoir for sanitisation and can be used for the automatic CIP cycles.

Reverse osmosis
RO technology involves using a variable speed pressure pump to force a portion of the feed water through semi-permeable membranes. The permeate flow is kept constant, independent of variables such as the feed water temperature.

Continuous electro deionisation
The water passing through the CEDI is deionised to purified water using an electric current. The concentrate water exiting the CEDI unit is reused and mixed with the RO feed water.

Ultraviolet irradiation/ultrafiltration
The pure water exiting the CEDI passes to a UV unit or a 6,000 NMWL ultrafilter to give added security in achieving the purified water specifications.

The ASEPSYS control system

  • Utilises the latest technology with touch screen HMI to allow ease of operation and monitoring.
  • Offers control and monitoring from a single interface with data logging facilities and links to user systems e.g., BMS, DCS or SCADA.
  • Provides the flexibility to operate complete turnkey packages allowing customers to reduce costs and simplify operation using a single access interface for pre-treatment, purification, storage and distribution.
  • Ensures safe operation, protecting the system and the operator, giving you confidence and peace of mind.

Operating principle

The pre-treated (softened) water is passed through a filter housing (typically 5 µm) and analysed for free chlorine prior to entering the RO feed tank. The filtered water then enters the stainless storage tank, if the tank is full the softened water is returned to the raw water tank to ensure constant movement to minimise the risk of bacterial proliferation.

The softened water is then pumped at high pressure using a stainless steel multi-stage centrifugal pump, through the RO membranes. The RO permeate is then fed through a membrane degasser to remove dissolved carbon dioxide, followed by a CEDI unit in order to remove ionic contaminants. The purified water is then passed through a UV irradiator unit before being fed to the storage vessel.


Puretech engineered and installed a purified water to system at the AstraZeneca Research and Development Centre, Cambridge, taking raw water from the mains through purification using OASYS units. The purified water, which is stored in a 5000-litre tank, is distributed via a stainless-steel ring main to user points in the laboratories.

Downloads &