Commercial reverse osmosis is a water treatment technology that removes dissolved salts, heavy metals, microplastics and other contaminants from water by forcing it through a semi-permeable membrane. Sovereign Water supplies and installs commercial RO systems for UK businesses — from cafés producing thousands of coffees a day, to food factories, pharmaceutical premises and large-scale water bottling operations.
The commercial RO range includes the Imperial RO, Majestic RO, Noble RO 60 and Industrial RO units. Each model is sized by daily capacity to match the water demand of the site, and all use food-grade membranes certified for direct drinking water application.
TL;DR
- Commercial RO systems remove up to 99% of dissolved solids, heavy metals and microplastics
- Commercial RO is sized by daily capacity — from small café units to industrial-scale systems
- RO water is ideal for coffee, ice, steamers and food production where water quality is critical
- Commercial RO is not a softener — it removes dissolved contaminants, not hardness minerals
- A complete system typically includes pre-filtration, RO membrane and remineralisation
In This Article
- What Reverse Osmosis Does
- How Commercial RO Works
- The Sovereign Water RO Range
- Where RO Fits in a Water Treatment Train
- RO vs Softening vs Filtration
- Membrane Life and Maintenance
- Frequently Asked Questions
- Need Help Sizing a Commercial RO System?
What Reverse Osmosis Does
Reverse osmosis removes dissolved contaminants from water using a semi-permeable membrane. When water is pressurised against the membrane, pure water molecules pass through while dissolved salts, heavy metals, microplastics, pesticides and other contaminants are carried away in the waste stream.
A properly sized commercial RO system can remove up to 99% of dissolved solids, including lead, copper, arsenic, nitrates, fluoride and microplastics. This makes it the most effective single-stage treatment for producing high-purity drinking water from any source.
How Commercial RO Works
Commercial RO works in stages. First, water passes through a sediment pre-filter to remove particulates that could clog the membrane. Then it passes through a carbon filter to remove chlorine, which would damage the membrane. The water then enters the RO membrane housing, where a pressure pump pushes it through the semi-permeable membrane.
Pure water (permeate) collects in a storage tank or flows directly through the system, depending on the model. The remaining concentrated water (brine) carries the removed contaminants away to waste. Finally, the permeate passes through a post-filtration stage — often a remineralisation filter — which adds back small amounts of beneficial minerals and adjusts the pH before the water reaches the point of use.
The Sovereign Water RO Range
The Sovereign Water commercial RO range covers a range of capacities. Each model uses food-grade thin-film composite membranes and stainless steel or pressure-rated vessels for durability in commercial environments.
The models are:
- Imperial RO - Compact commercial RO for small cafés, offices and sites with moderate daily demand
- Majestic RO - Mid-range commercial RO for busy restaurants, hotels and medium-scale food production
- Noble RO 60 - High-capacity unit designed for large hotels, hospitals, food factories and high-throughput applications
- Industrial RO - Maximum capacity for large-scale water production, bottling operations and industrial processes
All models are sized by daily capacity. Sizing starts with the daily water demand of the site and the quality of the incoming water. A small café with one coffee machine and a small kitchen might need the Imperial RO. A large hotel with multiple coffee stations, a restaurant, an ice machine and a kitchen will typically need the Noble RO 60 or Industrial model.
Where RO Fits in a Water Treatment Train
Commercial RO is typically installed after softening and pre-filtration. The softener removes hardness minerals that could scale the RO membrane. The sediment pre-filter protects the membrane from particulates. The carbon filter removes chlorine, which would degrade the membrane over time.
This means RO is only one stage in a complete treatment train. A typical commercial drinking water system might include: softener for hardness, sediment pre-filter for particulates, carbon filter for chlorine, RO membrane for dissolved contaminants, and a post-filter for remineralisation and taste. Each stage addresses a different parameter.
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RO vs Softening vs Filtration
A commercial RO system does not replace softening or filtration. It addresses dissolved contaminants specifically, while a softener addresses hardness minerals and a filter addresses particulates and chlorine.
A water softener removes calcium and magnesium. A sediment filter removes sand, silt and rust particles. A carbon filter removes chlorine and taste issues. Commercial RO removes dissolved salts, heavy metals and microplastics. Each addresses a different water quality parameter, and a complete system typically includes all four stages.
Membrane Life and Maintenance
The RO membrane in a commercial system typically lasts three to five years, depending on the quality of the incoming water and the volume of water treated. Pre-filtration quality is the single biggest factor in membrane life — if the sediment and carbon pre-filters are not maintained, the membrane will foul faster and need replacing sooner.
Replacement filters need regular replacement. Sediment pre-filters typically last three to six months. Carbon pre-filters typically last six to twelve months. The post-filtration remineralisation element typically lasts six to twelve months. The RO membrane itself typically lasts three to five years.
The RO system should be monitored regularly. Most commercial units include a TDS (total dissolved solids) meter on the permeate line, which allows operators to check whether the membrane is still removing contaminants effectively. If the TDS of the treated water rises significantly above the inlet water's TDS, the membrane needs replacing.
Frequently Asked Questions
What is the difference between the Imperial RO and Majestic RO?
The difference is daily capacity. The Majestic RO produces more treated water per day, making it suitable for sites with higher daily demand. The Imperial RO is suitable for smaller sites.
Does commercial RO remove hardness from water?
No. RO removes dissolved contaminants but does not soften water. If the incoming water is hard, a softener should be installed before the RO unit to prevent membrane scaling.
How much waste water does an RO system produce?
The waste ratio depends on the model and the incoming water quality. Typical commercial RO systems produce between two and four litres of waste water for every one litre of treated water. Newer high-efficiency models can improve this ratio.
Is RO water safe to drink?
Yes. RO-treated water is safe and widely used in drinking water systems worldwide. The post-filtration stage often adds back small amounts of beneficial minerals and adjusts pH to produce pleasant-tasting water.
How often does the RO membrane need replacing?
The RO membrane typically lasts three to five years, depending on the quality of the incoming water and the maintenance of the pre-filters. The TDS meter allows you to check when replacement is needed.
Need Help Sizing a Commercial RO System?
Sizing a commercial RO system depends on your site's daily water demand and the quality of the incoming water. We can test your water and recommend the correct RO system for your application.