[ Product listing ](/en/technologies-1 " Product listing") #### A reverse osmosis system that produces high-purity water, removing up to 98% of dissolved inorganics and over 99% of large dissolved organics, colloids and particles from brackish water. [Contact an expert](https://www.veoliawatertechnologies.com/en/contact) [Overview](#1) [Applications](#2) [Services](#3) [Product range and Resources](#4) [Contact](#5) ## Overview **Sirion™ Midi** is a standardized one pass reverse osmosis (RO) system designed to meet your demand for high-purity water and when an energy-efficient process water production system is required. Ideal for the [**pharmaceutical and cosmetics**](/en/core-markets/pharmaceutical-cosmetics "Pharmaceutical & Cosmetics") industries,[ **laboratories**](/en/core-markets/laboratories "Laboratories"), [**healthcare**](/en/core-markets/healthcare "Healthcare "), [**food and beverage**](/en/core-markets/food-beverage "Food and Beverage "), and [**power**](/en/core-markets/power "Power") industries, these performant, compact and plug-and-play units ensure a small footprint and reduced operating requirements. **Skid mounted** and **pre-commissioned**, Sirion Midi is a cost-effective solution with minimal requirements for civil engineering and **extremely short delivery and start-up times.** ### How does Sirion Midi work? Reverse osmosis plants produce permeate water with a quality of 5 - 20 μS/cm from regular drinking water. The conductivity value of strongly mineralised water can be considerably higher. **The programmable measurement and control electronic board installed in the cabinet monitors the complete treatment process and displays measured values on the display** (front of equipment). Osmosis is a natural process whereby water from a solution of low salinity passes a semipermeable layer/membrane to a solution of high salinity. The process ends when both solutions have the same concentration or an osmotic balance is achieved by level difference and therefore increasing back pressure. The osmosis process is reversible and can therefore be used for [**water desalination**](/en/applications/desalination "Desalination"). If you put pressure higher than the natural osmotic pressure on the side of high salinity, pure water diffuses from the solution through the semipermeable membrane. **New controller RO7** RO7 features a 4” HMI touch-screen and a simplified interface, it enhances usability by providing better visualization of process parameters and settings, improved manual control, and a refreshed, modern appearance. Additionally, it offers increased flexibility with adjustable parameters from a maintenance perspective, ensuring the system remains easy to operate and maintain. [Do you have a question about this technology? Ask an expert.](https://www.veoliawatertechnologies.com/en/contact) ![Man in front of a Sirion Midi unit](/sites/g/files/dvc4591/files/styles/media/public/image/2024/10/Sirion-Midi.png.webp?itok=pXoxxCdY) ## Features and benefits ![](/sites/g/files/dvc4591/files/styles/default/public/image/2023/02/Cost-efficiency-picto.png.webp?itok=_SzM96y6) **Cost savings** Low energy membranes result in lower operating pressures ![](/sites/g/files/dvc4591/files/styles/default/public/image/2023/01/Footprint-picto1.png.webp?itok=m1DT26wx) **Small footprint** Optimized flow / size ratio ![](/sites/g/files/dvc4591/files/styles/default/public/image/2023/07/Touch-sensitive.png.webp?itok=VKb6spbm) **Easy to use and monitor** Programmable user interface monitoring and storage (14 days) of flow rate, conductivity and temperature values. ![Picto of a monitoring center with three people](/sites/g/files/dvc4591/files/styles/default/public/image/2024/07/Smart-monitoring-center.png.webp?itok=9QzMXtvr) **Optimized visualization of process parameters and settings** Improved manual control and a modern, refreshed layout. ![](/sites/g/files/dvc4591/files/styles/default/public/image/2023/05/Test-Licence-to-operate%20picto.png.webp?itok=RRMVscAB) **Quality guaranteed** Treated water diverted at startup Membrane protection ![ENVIRONMENT picto](/sites/g/files/dvc4591/files/styles/default/public/image/2022/04/environment-picto-64.png.webp?itok=ELdzQqDp) **Sustainable** Timed recirculation rinse, reduces membrane fouling ## Applications [ ![](/sites/g/files/dvc4591/files/styles/content_push_teaser/public/image/2019/06/Push-laboratories.jpg.webp?itok=fltCqONj) ](/en/applications/laboratory-water "Laboratory Water") [Laboratory Water](/en/applications/laboratory-water "Laboratory Water") Water and distribution systems that produce ultra high-purity laboratory water for use in research and clinical diagnosis [Read more](/en/applications/laboratory-water "Laboratory Water") [ ![](/sites/g/files/dvc4591/files/styles/content_push_teaser/public/image/2019/11/Process-Water-Banner.jpg.webp?itok=gKDFHfTa) ](/en/applications/process-water "Process water") [Process water](/en/applications/process-water "Process water") High quality water systems for production, process and manufacturing uses. [Read more](/en/applications/process-water "Process water") [ ![](/sites/g/files/dvc4591/files/styles/content_push_teaser/public/image/2019/11/Utillity-feed-water-push.jpg.webp?itok=5J_s2hbl) ](/en/applications/utility-feed-water "Utility Feed Water") [Utility Feed Water](/en/applications/utility-feed-water "Utility Feed Water") Technologies for optimising boiler feed water and cooling tower feed to minimise chemical usage. [Learn More](/en/applications/utility-feed-water) [ ![Water reuse Content push](/sites/g/files/dvc4591/files/styles/content_push_teaser/public/image/2022/03/Istres%20EU%20Reuse.jpg.webp?itok=CsQgZYMA) ](/en/applications/reuse "Water reuse") [Water reuse](/en/applications/reuse "Water reuse") Solutions allowing the use of treated wastewater for beneficial purposes. [LEARN MORE](/en/applications/reuse) ## Services Local after-sales service and support teams offer preventative and corrective maintenance programs to ensure the long-term, efficient operation of installed plants. We also provide: [ ![Service man controlling valves](/sites/g/files/dvc4591/files/styles/content_push_teaser/public/image/2019/06/Service.jpg.webp?itok=VPLkv927) ](/en/services/installed-base-services "Installed Base Services") [Installed Base Services](/en/services/installed-base-services "Installed Base Services") Providing best-in-class water treatment services tailored to your exact needs to optimize the operational performance of your facility. [LEARN MORE](/en/services/installed-base-services) [ ![hydrex Water treatment chemical programs ](/sites/g/files/dvc4591/files/styles/content_push_teaser/public/image/2022/01/Copy%20of%20Jebel%20Ali%20LHW-2495.jpg.webp?itok=CUcU7fAv) ](/en/services/water-treatment-chemical-programs "Water treatment chemical programs") [Water treatment chemical programs](/en/services/water-treatment-chemical-programs "Water treatment chemical programs") Bundling high performance specialty chemicals, innovative dosing and controlling equipment with related expert support. [LEARN MORE](/en/services/water-treatment-chemical-programs) ## Product range and Resources Product range - Midi RO 10-100-EP - Midi RO 10-200-EP - Midi RO 10-300-EP - Midi RO 10-500-EP - Midi RO 10-750-EP [ ![Lateral view of a Sirion Basic model two](/sites/g/files/dvc4591/files/styles/vwt_product_content_push/public/image/2025/12/Sirion-basic-push.jpg.webp?itok=7Hyw59GS) ### Sirion™ Basic Veolia’s Sirion Basic entry-level reverse osmosis system delivers efficient ion reduction and industrial water purification. Available in Midi (100-350 l/h) and Maxi (500-3,000 l/h) models with intuitive controls, compact design, and factory testing for immediate operation. Membrane Filtration - reverse osmosis ](/en/solutions/technologies/sirion-basic) [ ![](/sites/g/files/dvc4591/files/styles/vwt_product_content_push/public/image/2023/10/Sirion-Mega-push.jpg.webp?itok=VuLeZnGR) ### SIRION™ Mega High flux and low energy reverse osmosis. Membrane Filtration - reverse osmosis ](/en/technologies/sirion-mega) [ ![SIRION™ Advanced & Pro Hero Banner](/sites/g/files/dvc4591/files/styles/vwt_product_content_push/public/image/2020/01/Service%20Operator_HMI_SIRION%201.JPG.webp?itok=gbTndJrE) ### Sirion™ Advanced Sirion™ Advanced premium water treatment for hospitals, power generation, and electronics industries. Advanced reverse osmosis membrane technology with smart water monitoring delivers reliable energy efficient water production up to 5,000 l/h. Membrane Filtration - reverse osmosis ](/en/solutions/technologies/sirion-advanced) [ ![](/sites/g/files/dvc4591/files/styles/vwt_product_content_push/public/image/2021/03/Sirion-Seawater-push.jpg.webp?itok=4eafO3r0) ### SIRION™ Seawater Reverse osmosis systems specially designed to treat seawater. Membrane Filtration - reverse osmosis ](/en/technologies/sirion-seawater) [ ![SIRION™ Mini](/sites/g/files/dvc4591/files/styles/vwt_product_content_push/public/image/2019/01/Sirion-Mini.jpg.webp?itok=N73KApTQ) ### SIRION™ Mini & Midi Compact reverse osmosis systems for purity water. Membrane Filtration - reverse osmosis ](/en/technologies/sirion-mini-midi) [ ![](/sites/g/files/dvc4591/files/styles/vwt_product_content_push/public/image/2022/09/Sirion-Mega-SF.png.webp?itok=wDIT8L-f) ### Sirion™ Sirion™ is a set of reverse osmosis product ranges designed to produce high purity water, removing up to 98% of dissolved inorganics and over 99% of large dissolved organics, colloids and particles. Membrane Filtration - reverse osmosis ](/en/solutions/technologies/sirion) Resources [PDF Sirion Midi - Reverse osmosis for process water (3.33 MB) ](/sites/g/files/dvc4591/files/document/2025/05/DS-%20Sirion%20Midi%20Datasheet-%20EN%20%281%29.pdf) ## Contact The Sirion Midi has continually evolved since its 2008 launch, enhancing and adapting to meet the ever-changing needs of the market. Now, with the integration of the new RO7 controller, it enhances process parameter visualization and settings, improves manual control, and boasts a sleek, modern design. ![Marinaella Guitérrez picture](/sites/g/files/dvc4591/files/styles/default/public/image/2024/10/Marianella-Guit%C3%A9rrez.jpg.webp?itok=v9zcliP8) #### Marianella Guitérrez Project Engineer ## FAQ about Sirion™ Midi ### Why is reverse osmosis suited for the production of high-purity water? Reverse osmosis is ideal for the production of high-purity water because it effectively separates the feed stream into a concentrate stream, which contains most of the dissolved material, and a permeate stream, which is purified water. The process allows the passage of water but not salts, thus extracting high-quality water from a saline water solution. The most suitable membrane is chosen for each system, and while it cannot remove 100% of salts, it can achieve up to 99.5% removal. Reverse osmosis systems are also adaptable, cost-effective, and simple to run, making them ideal for various applications.For the Sirion Midi the typical salt rejection is 96-98%. ### What are the advantages of a skid mounted unit for water treatment? A skid mounted unit for water treatment has several advantages. It allows for easy installation and minimal start-up time. It also has a small footprint, which saves on plant space. ## Technologies related to Sirion™ Midi [ ![](/sites/g/files/dvc4591/files/styles/vwt_product_content_push/public/image/2023/10/Sirion-Mega-push.jpg.webp?itok=VuLeZnGR) ### SIRION™ Mega High flux and low energy reverse osmosis. Membrane Filtration - reverse osmosis ](/en/technologies/sirion-mega) [ ![SIRION™ Advanced & Pro Hero Banner](/sites/g/files/dvc4591/files/styles/vwt_product_content_push/public/image/2020/01/Service%20Operator_HMI_SIRION%201.JPG.webp?itok=gbTndJrE) ### Sirion™ Advanced Sirion™ Advanced premium water treatment for hospitals, power generation, and electronics industries. Advanced reverse osmosis membrane technology with smart water monitoring delivers reliable energy efficient water production up to 5,000 l/h. Membrane Filtration - reverse osmosis ](/en/solutions/technologies/sirion-advanced) [ ![](/sites/g/files/dvc4591/files/styles/vwt_product_content_push/public/image/2021/03/Sirion-Seawater-push.jpg.webp?itok=4eafO3r0) ### SIRION™ Seawater Reverse osmosis systems specially designed to treat seawater. Membrane Filtration - reverse osmosis ](/en/technologies/sirion-seawater)