From potability to purity control: a fit-for-purpose approach to water management
In the food & beverage sector, water is not just a raw material, but a true process variable. Its quality has a direct impact on product stability, operational continuity, equipment longevity and regulatory compliance.
Often defined as an “invisible ingredient”, water can account for up to 90% of the final volume of many products, especially beverages and processed foods. Although it does not appear on labels, it influences taste, consistency and shelf life.
As a process medium, water is essential for equipment cleaning, Clean in Place (CIP) operations, cooling, steam production and product conveying throughout the entire production cycle.
Since each phase has different requirements, it is essential that its properties are suited to each specific use. Treating all water in the same way would in fact be neither technically necessary nor economically efficient.
In a modern food & beverage facility, this means designing water systems capable of adapting to the process, not the other way around. Water quality therefore becomes an engineering variable to be managed, not just a parameter to be complied with.
Potable Water
WHO guidelines define potable water as water that is safe for human consumption, for the preparation of food and beverages, or for domestic use, free from contaminants that may cause immediate or long-term harm to health. Potability standards include microbiological parameters (absence of pathogens such as E. coli), limits for chemical contaminants such as arsenic, nitrates or lead, and physical requirements such as turbidity and controlled pH ranges.
From a plant engineering perspective, however, potability does not automatically equate to process compatibility. Water that is perfectly compliant for human consumption may contain salts, silica or natural organic substances capable of generating scaling, reducing thermal efficiency or compromising the stability of sensitive lines.
For this reason, depending on the specific use (such as boiler feed, UHT processing, high-sensitivity formulations or closed-loop systems), additional treatment stages are necessary to ensure that water quality matches the standards required.
At the design stage, the point is not to ask whether the water is potable, but whether it is compatible with the operating conditions required by the process.
Process Water
Process water is water specifically treated and used for industrial or technical applications. According to a report by the FAO and WHO, unlike drinking water, which is guaranteed to be safe for human consumption, process water is optimized to meet operational requirements such as production reliability, equipment longevity, and hygiene compliance. As a result, depending on its application, it can have different physical, chemical, and biological properties.
Process water is used for a multitude of purposes, including equipment washing water, Clean-in-Place (CIP) systems, cooling systems, boiler water, steam generation and product conveying. Its characteristics are defined based on operational parameters such as conductivity, hardness, microbiological load, solids content and chemical stability.
For example, beverage processing requires a low mineral level to avoid any unpleasant taste.
The main difference compared to potable water is functional suitability. Although potable water is safe, it is not designed to guarantee stable process conditions or safeguard equipment. Process water treatment requires a balance between level of treatment and operating costs: oversizing the system means unnecessarily increasing operating expenses; undersizing it means exposing the plant to potential shutdowns and regulatory non-compliance.
Ultrapure Water
Ultrapure water or highly demineralized water represents the highest level of purity required in sensitive industrial applications.
In the food and beverage industry, ultrapure water is used selectively in specific applications that require high sensitivity. It may be used when it is in direct contact with the product and even trace impurities could affect taste and stability or create inconsistencies in the process.
Examples include the production of demineralized beverages with strictly controlled flavor profiles, sterile rinsing operations and the generation of high-purity steam for sterilization.
This level of purity is achieved through advanced treatment stages that allow significant removal of salts, organic contaminants and microbiological load. These generally include stages such as reverse osmosis, ultrafiltration, electrodeionization and degasification. Parameters such as conductivity or total organic carbon are generally not regulated by universal legislative limits in the food & beverage industry but are defined by process specifications or internal technical standards.
The difference compared to potable water and process water is therefore substantial. Potable water is designed to be safe for consumption but still contains minerals and compounds that may interfere with sensitive processes. Process water is designed to support operations efficiently, with quality tailored to specific uses. Ultrapure water goes one step further: it is used when even minimal variability is unacceptable and maximum control is required.
Designing truly fit-for-purpose water systems
In water treatment for the food & beverage sector, there is no standard solution. Each plant may differ depending on incoming water quality, specific process requirements and energy and space constraints.
As regulatory and quality requirements become increasingly differentiated and interconnected, water management in industrial plants requires an integrated engineering approach capable of evaluating the entire cycle: from raw water intake to reuse or discharge.
Hydrotech Engineering designs and builds tailor-made turnkey plants for process water treatment, managing all phases of engineering, construction and automation internally. Each project starts with a preliminary physico-chemical analysis and the study of plant water flows, in order to define the levels of treatment truly required and configure a plant architecture consistent with the existing production layout.
From conceptual design to detailed engineering, from in-house construction and pre-assembly to post-installation support, Hydrotech Engineering manages the entire cycle. This reduces risks, simplifies coordination and allows more controlled implementation timelines.
Hydrotech Engineering’s process water treatment
In process water treatment for the Food & Beverage sector, Hydrotech Engineering proposes systems structured in three main phases, designed to respond to the specific needs of each facility. Technologies used such as pre-treatments, membranes, activated carbon and UV systems are selected and sized according to the process, not the other way around.
- Pre-treatment: Starting with a chemical-bacteriological water analysis to identify the most effective technological combination. Solutions include disinfection (e.g., sodium hypochlorite), multimedia filtration to remove suspended solids and metals (such as iron and manganese), and ultrafiltration (UF) using semipermeable membranes to eliminate bacteria, colloids, and viruses, ensuring high-quality water with low maintenance costs.
- Main treatment: The core process involves granular activated carbon (GAC) filtration to remove chlorine, pesticides, organic compounds, and substances causing unpleasant odors or tastes. This is combined with reverse osmosis (RO) to remove salts, heavy metals, endotoxins, and antibiotics, ensuring maximum water purity. Alternatively, nanofiltration (NF) may be used for selective removal of ions like calcium and magnesium, reducing hardness and watercolor.
- Post-treatment: The final phase uses UV rays to eliminate microorganisms such as bacteria, viruses, and fungi without chemicals and without altering water’s organoleptic properties, ensuring maximum microbiological safety.
The objective is not to apply a standard sequence of technologies, but to build an integrated and scalable system consistent with the specific production requirements of the facility. Hydrotech Engineering designs, develops and builds water treatment projects conceived to be fit-for-purpose and sustainable over time.
If you would like to learn more about how to design water systems that truly meet the needs of your plant, download our brochure dedicated to water management in the food & beverage industry. If you prefer to speak with an expert, fill out the form here and we will contact you shortly.
