Combined Water Purification Systems

Pretreatment and Polishing in One Water Purification System

Combined water purification systems pair pretreatment and final polishing purification technologies into one system to give your laboratory flexibility and versatility. Produce high-quality ultrapure water and pure or reverse osmosis (RO) water to accommodate your needs reliably and consistently.

Purified water is housed in an intermediate storage utilizing Sartorius innovative Arium® Bags to maintain the high quality of the purified water until you need it.

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Combined Water Systems

Arium® Mini Plus Combined Water Purification System 

Combined water system for low daily volumes

The Arium® Mini Plus provides ultrapure water for small daily volume needs (up to 10 L/day). The system uses a 5 L integrated Arium® Bag to store pretreated reverse osmosis (RO) water before the final polishing. Choose the optional UV-lamp for TOC-sensitive analytical applications or the external point-of-use ultrafilter for life science applications.

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Arium® Comfort I Combined Water Purification System

System for high-quality RO and ultrapure water

The Arium® Comfort I water purification system provides ultrapure water for a recommended daily volume up to 40 L/day. In addition to ultrapure water, the Arium® Comfort I produces high-quality RO water with the help of innovative iJust® software. Pretreated water is housed in our intermediate water storage system - Arium® Bagtank - before further polishing or other utilization. Choose a system with one or two RO-modules, UV-lamp or external point-of-use ultrafilter depending on your needs.

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Arium® Comfort II Combined Water Purification System

0,02-0,07 µS/cm pure water and ultrapure water

The Arium® Comfort II utilizes innovative technologies like iJust® software and EDI technology to produce high-quality pure water, which can be further polished to ultrapure water for a recommended daily volume up to 40 L/day. Thanks to the Arium® Bagtank, pure water is stored to maintain high quality until it is needed. Choose, depending on your needs, a system with one or two RO-modules, an optional UV-lamp or an external ultrafilter at the dispense point.

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Supporting Products for Arium® Combined Water Systems

Arium® Smart Station in use

Arium® Smart Station Water Dispensing System

A flexible solution for dispensing pure and ultrapure water

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Arium® Bagtank

Arium® Bagtanks

The innovative Arium® Bagtank uses a closed system to store your purified water and protect it from secondary contamination and keep the quality.

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Features and Benefits of an Arium® Combined Water System

Arium water purification

Compact design saves valuable workspace


Optimized water usage ensured by intelligent iJust® feature


Arium® Bag provides reliable protection against secondary contamination and eliminates the need for regular tank cleaning


Glass display with touch-activated functions and intuitive menu navigation

Featured Resources

Educational Ultrapure Water System Resources

A guide to high quality laboratory water ebook cover

A Guide to High-Quality Laboratory Water

This Sartorius eBook is an informative guide for choosing the right water purification system for your laboratory.

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Ultrapure Water: The Basis for Reliable Laboratory Results

Ultrapure Water: The Basis for Reliable Laboratory Results

Consistent, high water quality is vital to ensure data reproducibility and avoid time-consuming repeat analyses. Learn more in this webinar!

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Arium Ultrapure Water for Trace Analysis cover
Application Note

Ultrapure Water for Trace Analysis

Learn about the suitability and purity of different sources of ultrapure water used as an eluent in HPLC-DAD and MS systems.

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Scientist with Arium Comfort

Services for Arium® Water Purification Systems

Secure and optimize your lab water equipment operation with installation, qualification, calibration, and regular maintenance.

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Frequently Asked Questions

A combined water purification system is a single system that can produce different water qualities. Generally, it means the system produces both ASTM Type 1 Ultrapure and ASTM Type 2 Pure or reverse osmosis (RO) water. 

If you need different water qualities (because of different applications, for example) but have limited space in your laboratory, a combined water purification system might be a good option. Another reason to consider a combined water purification system is when you need ultrapure water directly from a tap water source.

The most notable benefit of a combined water purification system is that it can produce ultrapure water directly from tap water. It also saves laboratory space by combining a pretreatment and polisher system into one. In addition to ultrapure water, a combined water purification system also gives you access to either pure or RO water. Having a combined system also leads to less maintenance (one system instead of two).

By combining a pretreatment system and a polisher system into one, you will produce two different qualities of water (ultrapure and RO) with one system. The main difference of combining two systems into one is the recommended daily volume. The individual respective water purification systems usually have larger cartridge capacities and therefore have a higher recommended daily volume.

A combined water purification system produces two different water qualities suitable for a wide range of applications. The ultrapure water produced can be used for applications that require ultrapure water, while the pure or RO water is suited to general laboratory or feed water applications. If your critical applications have specific requirements, make sure your combined water purification system has the necessary added purification technologies to accommodate the needs, such as UV or ultrafiltration.

An intermediate water storage tank is needed in combination with a combined water purification system. As the pretreatment step usually consists of an RO module (and perhaps other filtration-based steps), the flow rate after pretreatment is quite low. To utilize the purified water after pretreatment with sufficient pressure and flow rate, an intermediate storage tank is needed before the polishing step.

An intermediate storage tank is needed with a combined water purification system between the pretreatment stage and the polishing cycle. Depending on the storage tank itself, there will generally be an option to dispense pure or RO water from the storage tank - either directly from the tank (via tubing or similar) or by connecting a remote dispenser.

A combined water purification system consists of a pretreatment stage and a separate polisher stage in one system. The pretreatment step usually consists of a reverse osmosis module (RO water) prior to an optional deionization cartridge (ASTM Type 2 water). Additional steps can include activated carbon and/or depth filters before the RO module to protect and extend its life cycle. After pretreatment, intermediate water storage is needed before returning the pretreated water to the polisher cycle. The following polisher step then includes another deionization cartridge and activated carbon before being dispensed via a final point of use filter. Additional UV lamp or ultrafiltration might be included as well.

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