How Beverages Are Manufactured: Batching, Treatment, Filling and Release

How beverages are manufactured: the six stages

How beverages are manufactured follows one logic, whatever the drink. Water and ingredients are prepared, combined to a fixed recipe, treated to control microbes, filled and sealed, checked and released, then stored and distributed. Juices, soft drinks, plant-based drinks and functional shots differ in recipe and process, but the points where safety and quality are won or lost are the same.

In Great Britain, food businesses must put in place procedures based on HACCP principles: identify the hazards at each step, set critical limits at the points that control them, monitor, correct and keep records^[1]. The Food Standards Agency (FSA) notes that the low pH of fruit generally prevents pathogenic bacteria from growing, but that pathogens can survive without multiplying, which is a particular concern in unpasteurised products^[2]. That is why the beverage production process is designed as a chain: recipe, treatment, filling and release are planned together, not one at a time.

Water treatment and ingredient preparation

Water is usually the largest ingredient, so its quality sets the baseline. GB hygiene law requires an adequate supply of potable water for food use^[1]. Plants then treat it to suit the drink: particle filtration, activated carbon to remove chlorine taste, softening or reverse osmosis where mineral content affects flavour, and sometimes UV. Treated water is held to a written specification and tested routinely.

Ingredient preparation covers concentrates, juices, sugars or sweeteners, acids, flavours, vitamins and colours. Supplier approval, specification checks and allergen control happen here. For juice, raw material control is the first safety step, because acidity alone does not remove pathogens that arrive on the fruit^[2].

Batching, blending and standardisation

Batching combines water and ingredients to a set recipe, in batch tanks or by in-line dosing. Standardisation then adjusts the drink to specification: soluble solids measured as Brix, acidity and pH, colour and flavour intensity. Consistency here protects the label, because composition and labelling are what enforcement officers sample.

In the FSA’s 2023–24 surveillance sampling programme, 30 orange juice samples were tested for unauthorised colours, Brix, sulphur dioxide and labelling, and the compliance rate was 87%. One sample was below the legal minimum Brix of 11.2 for orange juice from concentrate, and three declared more sugar than the juice contained, outside the ±20% guidance tolerance^[3]. For juices, the reserved names and composition rules sit in the Fruit Juices and Fruit Nectars (England) Regulations 2013^[4].

The recipe itself is designed before batching starts; our functional beverage formulation guide covers that step, and food formulation from brief to stable prototype explains how a bench recipe is locked. A formula that works at bench scale must still be dosed accurately at plant scale.

Carbonation and clarification

Carbonation dissolves carbon dioxide into the chilled drink under pressure, usually just before or during filling, to a level set by the recipe; our sparkling water carbonation trial shows how CO₂ retention is tracked. Clarification by filtration, centrifugation or enzymes removes haze and particles in drinks such as clear juices, and the choice affects flavour and the later treatment step.

Formulator’s note: lock the recipe specification before pilot runs. Set Brix, pH, acidity and fill volume as target ranges with action limits. A recipe that drifts between batches changes both the treatment result and the label compliance of the drink.

Heat or pressure treatment: the kill step

Treatment is the step that controls pathogens and spoilage organisms. The main options are pasteurisation in a plate or tubular heat exchanger, UHT treatment followed by aseptic filling for ambient products, hot filling, in-pack heat treatment such as retorting for low-acid drinks, and high pressure processing (HPP) of the sealed bottle. Our HPP vs thermal pasteurisation study explainer compares the two main kill steps, and hot fill vs cold fill vs aseptic vs HPP links each treatment to its filling route. For low-acid drinks that need in-pack sterilisation, see pilot retort trials.

A widely used benchmark comes from US law: juice processors must apply controls that consistently achieve at least a 5-log (100,000-fold) reduction in the most resistant pathogen of public health significance likely to occur in the juice^[5]. GB law sets no equivalent juice-specific figure, but a validated log reduction on the real recipe is the clearest way to show that the HACCP critical limits work. HPP is typically applied at 400–600 MPa for 1.5–6 minutes; it inactivates vegetative microorganisms but not bacterial spores, so a low-acid HPP drink still depends on refrigeration^[6].

Whichever treatment is used, the critical limits must be monitored and recorded. In 2019 a damaged seal on the flow divert valve of a pasteuriser at a dairy farm in England let raw milk contaminate pasteurised milk; the outbreak of STEC O157:H7 that followed had 21 confirmed cases, 12 of them treated in hospital, and the dairy stopped production and recalled its milk^[7]. A review of automation in milk and beverage processing argues that in-line sensing and automated data capture reduce the human error behind such failures^[8]. Hurdles such as pH and preservatives support, but do not replace, the kill step; see hurdle technology for functional drinks.

Filling, sealing and packaging

Filling and packaging turn a treated drink into a finished product, and they decide whether the treatment survives. The filler, pack, closure and filling environment must preserve what the treatment achieved, which is why hot fill, cold fill and aseptic routes each demand a different hygiene design. Seals are checked for integrity, containers for defects, and each pack is coded with a batch and date mark.

Hygiene is managed through scheduled cleaning. CIP (clean-in-place) circulates validated cleaning and sanitising solutions through tanks, pipes and fillers without dismantling them, and the result is verified, not assumed. A rapid evidence assessment of food safety culture interventions found that repeated practical training worked better than one-off knowledge training, and that management leadership is important for lasting change^[9]. Throughout, the Food Safety Act 1990 makes it an offence to sell food that is not of the nature, substance or quality demanded by the purchaser^[10].

Quality control and release

Release is a decision, not a formality. Before a batch leaves the plant, the team reviews the treatment records, Brix, pH, fill volume, seal checks and coding, and the microbiological results the HACCP plan requires. Release is made against written criteria, and any deviation holds the batch. For unpasteurised ready-to-eat juices, GB microbiological criteria set a food safety criterion for Salmonella (not detected in 25 g) and a process hygiene criterion for E. coli^[11].

Shelf-life testing supports the date mark. Samples are stored under defined conditions and tested over time for microbiology, sensory quality and key chemistry; the date is set from the data, not from the process name. See real-time vs accelerated shelf-life testing for study design and beverage stability testing for sedimentation and phase separation. A planned sensory study decides whether the drink still tastes right at the end of its life.

Scaling from pilot to production

Scaling carries risk, so pilot batches test the recipe, treatment and pack at small scale before a full run. A well-run transfer documents the critical parameters, confirms the scaled process meets the same targets, and repeats the shelf-life study on production-scale product. Our worked example on scaling a recipe from kitchen to pilot plant shows the arithmetic, and the heat-stable oat drink worked example follows a beverage from brief to batch.

When the chain fails: spoilage and recalls

Most beverage recalls trace back to one weak link: an incomplete treatment, contamination after treatment, a mislabelled allergen or additive, or spoilage organisms that survive and produce gas. Is cold-pressed juice safe? analyses real juice recalls in which HPP or pasteurisation was incomplete. The Slimsy squash recall shows a swollen-bottle recall caused by gas formation, and the beverage manufacturing FAQ answers the questions brands ask most often about processing, filling and shelf life.

Conclusion

Understanding how beverages are manufactured means seeing the beverage production process as a chain of controlled steps, where a weak link at any stage can undo a strong treatment. Design the recipe, treatment, filling and release together, record every critical limit, and prove the whole line at pilot scale before committing to a commercial run.

For brands & formulators

Food Research Lab supports UK beverage brands from Chennai, India. Our team develops and trials your recipe, defines the specification and critical limits, and plans the treatment, filling route and release criteria. Commercial production is managed through vetted manufacturing partners (co-packers), and microbiological, challenge and shelf-life testing is run or arranged through accredited partner laboratories.

See our beverages manufacturing service, new food product development for recipe work, and sensory research and analytics for end-of-life taste checks. You can also contact us with your recipe, target pack and shelf life.

In this series

• HPP vs thermal pasteurisation: what a named comparative study shows about safety, quality and nutrient retention.
• Hot fill vs cold fill vs aseptic vs HPP: choosing the filling and preservation route for a drink.
• How beverages are manufactured: the full production chain from water treatment to release (the hub of this series). (you are here)
• Is cold-pressed juice safe?: pathogens, HPP and what real juice recalls teach brands.
• Beverage manufacturing FAQ: short answers on processing, filling, shelf life and scale-up.
• Beverages manufacturing: take your drink from pilot batch to commercial production with FRL.

1. European Parliament & Council of the European Union. (2004). Regulation (EC) No 852/2004 on the hygiene of foodstuffs (Article 5; Annex II, Chapter VII), as assimilated in GB law. legislation.gov.uk. https://www.legislation.gov.uk/eur/2004/852/contents (cited for HACCP-based procedures and the potable water requirement)
2. Food Standards Agency. (n.d.). Food types and microorganisms of concern to food safety (MyHACCP guidance). https://myhaccp.food.gov.uk/sites/default/files/2022-03/food_types_and_microorganisms_of_concern_to_food_safety.pdf (cited for pathogens surviving without growth in low-pH fruit products, a particular concern in unpasteurised products)
3. Scarrett, A., & Cooke, S. (2024). Surveillance sampling programme (2023–24). Food Standards Agency. https://doi.org/10.46756/sci.fsa.edy500 (cited for the 30 orange juice samples, 87% compliance, the Brix failure and the three sugar-labelling failures)
4. The Fruit Juices and Fruit Nectars (England) Regulations 2013 (SI 2013/2775). legislation.gov.uk. https://www.legislation.gov.uk/uksi/2013/2775/contents (cited for reserved juice names and composition rules)
5. U.S. Food and Drug Administration. (2001, current text). 21 CFR 120.24 Process controls (Juice HACCP). eCFR. https://www.ecfr.gov/current/title-21/chapter-I/subchapter-B/part-120/subpart-B/section-120.24 (cited for the 5-log reduction requirement in the pertinent microorganism)
6. EFSA Panel on Biological Hazards (BIOHAZ), Koutsoumanis, K., Alvarez-Ordóñez, A., Bolton, D., et al. (2022). The efficacy and safety of high-pressure processing of food. EFSA Journal, 20(3), e07128. https://doi.org/10.2903/j.efsa.2022.7128 (cited for typical HPP conditions of 400–600 MPa and 1.5–6 min and that HPP does not inactivate spores)
7. Jenkins, C., Bird, P. K., Wensley, A., Wilkinson, J., Aird, H., Mackintosh, A., et al. (2022). Outbreak of STEC O157:H7 linked to a milk pasteurisation failure at a dairy farm in England, 2019. Epidemiology & Infection, 150, e114. https://doi.org/10.1017/S0950268822000929 (cited for the damaged flow divert valve seal, 21 confirmed cases, 12 hospital treatments and the recall)
8. Kyaw, K. S., Adegoke, S. C., Ajani, C. K., Nwabor, O. F., & Onyeaka, H. (2024). Toward in-process technology-aided automation for enhanced microbial food safety and quality assurance in milk and beverages processing. Critical Reviews in Food Science and Nutrition, 64(6), 1715–1735. https://doi.org/10.1080/10408398.2022.2118660 (cited for automated in-process monitoring to reduce human error)
9. McCallion, S., Beacom, E., Dean, M., Gillies, M., Gordon, L., McCabe, A., et al. (2025). Interventions in food business organisations to improve food safety culture: A rapid evidence assessment. Critical Reviews in Food Science and Nutrition, 65(26), 5066–5084. https://doi.org/10.1080/10408398.2024.2403004 (cited for repeated practical training and management leadership in food safety culture)
10. Food Safety Act 1990 (section 14). legislation.gov.uk. https://www.legislation.gov.uk/ukpga/1990/16/contents (cited for the offence of selling food not of the nature, substance or quality demanded)
11. European Commission. (2005). Regulation (EC) No 2073/2005 on microbiological criteria for foodstuffs (Annex I, criteria 1.20 and 2.5.2), as assimilated in GB law. legislation.gov.uk. https://www.legislation.gov.uk/eur/2005/2073/annex/I (cited for the Salmonella and E. coli criteria for unpasteurised ready-to-eat juices)