Pharma water treatment - what are we trying to remove?

Water underpins many pharmaceutical manufacturing activities, including use as an excipient, in product reconstitution, synthesis reactions, and cleaning. The pharmaceutical water market is valued at around USD 52 billion, and its critical role throughout production makes its quality a unique concern for manufacturers. Water is vulnerable to diverse contaminants throughout pharmaceutical production that can reduce treatment efficacy, damage equipment, compromise compliance, and pose risks to patient safety. Understanding the full range of contamination risks is essential for designing effective process filtration strategies that protect equipment, product quality, and patient safety.

At Atlas Copco, we support pharmaceutical manufacturers in understanding water treatment requirements and solutions across production to help ensure safe products reach patients. This page outlines the key contaminants affecting pharmaceutical water quality, how they enter the production process, and how appropriate process filtration can mitigate these risks.

Contaminants in pharmaceutical water can originate from the municipal supply used as the source for pharmaceutical-grade purification, as well as from in-plant sources such as storage and distribution systems. In-plant treatment steps can also influence contamination risk. For example, carbon or charcoal filtration removes chlorine used for bioburden control. While this step is necessary to protect downstream equipment such as reverse osmosis membranes, it also removes a key source of bioburden control and increases the importance of downstream contamination controls.

Microbial, particulate, and chemical contaminants are key considerations in pharmaceutical water and must be effectively controlled prior to use.

Microbial contamination is a major consideration for municipal source water, which may become contaminated through distribution pipe defects. Purification processes such as ion exchange and ultrafiltration are often performed at ambient temperatures, making them more susceptible to microbial growth, particularly during prolonged periods where equipment is not in use. Fermentation environments favour microbial proliferation, so controlling contamination upstream and downstream of these steps is vital.

Particulate matter may be present in incoming municipal water and can also be generated during pharmaceutical production, for example through corrosion, pipe defects, resin fines, or metal shed from equipment surfaces. Personnel within the plant represent a further source of particulates, including fibers from clothing and wipes, skin flakes, and hair, while also increasing the potential for microbial contamination.

Chemical contaminants present in water include dissolved inorganic species such as salts, sulfates, nitrates, and heavy metals and are removed in processes including softening, ion exchange, and reverse osmosis. Chlorine, used for bioburden control must also be removed to protect downstream instrumentation. These impurities must be removed or reduced to acceptable levels during purification before the water can be used for pharmaceutical purposes

Process filtration plays a vital role wherever water is used in pharmaceutical production, helping ensure product safety and efficacy. Required treatment levels depend on the intended application, including sterile and non-sterile products. The main filtration steps in pharmaceutical water purification are described below.

●     Prefiltration: This process is typically applied immediately as municipal water enters the pharmaceutical production facility. It removes particles and suspended solids that could damage more sensitive downstream filtration systems and reduce contaminant removal efficiency in later purification steps. Atlas Copco provides pleated polypropylene fibre filters, suitable for early prefiltration steps.

●     Activated carbon filtration: This step removes organic contaminants and volatile chemicals from water helping to protect downstream equipment. ASC filters from Atlas Copco help to ensure consistent water quality, extending the service life of purification infrastructure.

●     Sterilizing grade filters: These filters play a critical role in eliminating microbial contaminants from pharmaceutical water, including Water for Injection, and in sterile venting that protects stored water throughout the manufacturing process. We provide polytetrafluoroethylene (PTFE) membrane filters for venting and polyethersulfone (PES) membrane filters to ensure final sterility of water before use in critical pharmaceutical processes and aseptic production environments.

Water plays a fundamental role throughout pharmaceutical production, but its widespread use and origin from municipal supply make it uniquely vulnerable to contamination, requiring carefully selected control strategies. Process filtration is critical for mitigating waterborne contamination risks across pharmaceutical processes.

Contact our experts to learn how strategic process filtration can enhance water purity, protect critical processes, and support regulatory compliance.