Company lists · Data refreshed September 2026
Top 25 Reverse osmosis system builders based in the United Kingdom
RevenueBase identified 155 reverse osmosis system builders headquartered in the United Kingdom as of September 2026 and tracks 2,218 professional contacts across them, including 1,048 with verified work emails. London is the largest hub.
This list covers reverse osmosis system builders headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 21, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest reverse osmosis system builders based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 498 contacts → | ||||
Indirect evidence “RSE is a trusted clean water technology company, developing market leading products and solutions for purifying drinking water, recycling wastewater and cleaning water in…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 2 | 231 contacts → | ||||
Indirect evidence “Culligan UK delivers innovative, high-quality water solutions to homes and businesses across the United Kingdom.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 3 | 80 contacts → | ||||
Partial evidence “Salt Separation Services Limited is an independent water treatment company specialising in the design, manufacture, installation and commissioning of water treatment systems.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 4 | 75 contacts → | ||||
Indirect evidence “Envirogen Group is a global leader in industrial water treatment and process filtration solutions.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 5 | 75 contacts → | ||||
Partial evidence “At Siltbuster Ltd, we operate the UK’s largest rental fleet of water treatment systems, setting the industry benchmark for rapid, reliable, and cost-effective solutions.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 6 | 54 contacts → | ||||
Indirect evidence “Here at Borg & Overström, we have one mission; to empower our partners to achieve more through the creation of simple, innovative workplace refreshment.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 7 | 50 contacts → | ||||
Indirect evidence “Hydrotec is the UK’s leading company in the design and manufacture of water treatment products for the building services industry.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 8 | 40 contacts → | ||||
Partial evidence “At Billi, we design and manufacture a range of energy efficient filtered water systems that offer our customers the very best in innovation, superior performance and reliability.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 9 | 40 contacts → | ||||
Indirect evidence “Hydro Industries.generating clean water Clean Water is a limited natural resource essential for life and economic growth.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 10 | 32 contacts → | ||||
Indirect evidence “Tertiary water treatment specialist.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 11 | 28 contacts → | ||||
Indirect evidence “Filpumps was established in 1992 to fulfil a number of external factors.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 12 | 26 contacts → | ||||
Indirect evidence “Lubron Water Technology UK is part of the European Market leading water treatment provider, Lubron Group, which has subsidiaries in the Netherlands, Germany and Belgium.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 13 | 22 contacts → | ||||
Indirect evidence “Our core team have numerous years experience in the field of commercial water treatment and a proven track record of delivering effective, compliant water treatments packages.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 14 | 21 contacts → | ||||
Indirect evidence “At Excel Water, we pride ourselves on our unwavering commitment to delivering exceptional water treatment and purification solutions tailored to the diverse needs of our clients.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 15 | 16 contacts → | ||||
Indirect evidence “At PureH2O we put environmental sustainability at the heart of everything we do.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 16 | 15 contacts → | ||||
Indirect evidence “Salinity Solutions is a University of Birmingham spin-out, founded in 2021, focused on solving two of the world’s most pressing challenges: clean water and sustainable energy.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 17 | 15 contacts → | ||||
Indirect evidence “Your water.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 18 | 14 contacts → | ||||
Indirect evidence “Viltra specialises in designing, manufacturing and installing wastewater treatment solutions for a wide range of sectors throughout the UK and Ireland, including domestic…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 19 | 14 contacts → | ||||
Indirect evidence “Aquabio is a pioneering company born with a passion for innovation combined with a strong ethos for environmental sustainability.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 20 | 13 contacts → | ||||
Indirect evidence “Established in ByWater Services is a UK specialist in commercial water treatment, water recycling and wastewater management solutions.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 21 | 13 contacts → | ||||
Partial evidence “Plantwork Systems Ltd (PWS) provides water and wastewater treatment solutions with a strong focus on sustainability, innovation and cost efficiency.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 22 | 12 contacts → | ||||
Partial evidence “ESMIL Process Systems is an award winning Construction company located in United Kingdom.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 23 | 11 contacts → | ||||
Indirect evidence “ADEPT Pure Water Limited are specialists in the design, manufacture, commission, installation and Service of Water Purification and Treatment Plant and equipment.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 24 | 10 contacts → | ||||
Indirect evidence “Wycombe Water Ltd.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 25 | 10 contacts → | ||||
Indirect evidence “Water Tecnik specialises in delivering practical, compliant, and cost-effective industrial wastewater and effluent treatment solutions.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: reverse osmosis system builders. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names reverse osmosis system builders.
- Partial evidence
- Its own public description names part of reverse osmosis system builders, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name reverse osmosis system builders. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 155 reverse osmosis system builders based in the United Kingdom
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Reverse osmosis system builders based in the United Kingdom at a glance
As of Sep 21, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 155 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among reverse osmosis system builders, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United Kingdom whose own description of what they do matches “reverse osmosis system builders”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names reverse osmosis system builders), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among reverse osmosis system builders, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 1,048 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 21, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names reverse osmosis system builders, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many reverse osmosis system builders are there based in the United Kingdom?
RevenueBase identified 155 reverse osmosis system builders headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
RSE, headquartered in Inverness Highlands, tops this list with the largest team on record.
Which city has the most reverse osmosis system builders?
London leads with 11 headquartered companies, followed by Birmingham (3) and Bristol (3).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 1,048 verified decision-maker contacts tracked across these 155 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 21, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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