Dialysis Water Treatment
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Hemodialysis for
blood purification
Hemodialysis is a purification process used in acute or chronic kidney failure to remove harmful substances from patients' blood. In hemodialysis, up to 25,000 litres of dialysis fluid are used per patient per year. This dialysate consists of over 97 % pure water.
Water treatment therefore plays a central role in hemodialysis treatment. A suitable dialysate preparation system must guarantee maximum safety for the patient, enable reliable operation of the dialysis centre and be economical with resources by minimising water and energy consumption.
Dialysis water quality
and treatment
Our complete system for dialysis water treatment is designed to meet the highest hygiene requirements and ensure operational safety as well as minimal operating costs.
From pre-treatment to single-pass and double-pass reverse osmosis systems to dead-zone-free loop systems and state-of-the-art single or double dialysis stations – we can supply you with the best possible technology based on our many years of experience in the field of dialysis water treatment.
In order to meet the highest hygiene requirements, we offer systems with thermal disinfection of the complete reverse osmosis unit including the feed tank, the membrane modules, the loop and the dead-zone-free feed hoses for dialysis machines.
Herco's most efficient dialysis water treatment complies with MDR requirements. The MDR certificate valid since February 17, 2023, was issued by TÜV SÜD Product Service GmbH.
Our references
Successes that speak for themselves
"We have been relying on Herco's system technology for 19 years now and can testify to the reliability of the system technology and Herco's service. During this time, not a single membrane change has been necessary on the reverse osmosis system. This is possible thanks to the unique dead-zone-free design of the reverse osmosis system, the reliable maintenance and the particularly good quality of the sophisticated technology."
Christian Kalbrunner, Nierenzentrum Heidelberg (Head of Building Services and Energy Management)
Our reference plants
Dialysis water treatment technology made in Germany
Reverse Osmosis Unit HP5500D 750 P/H
Hot-cleanable twin pass system for a dialysis clinic in Morocco
Reverse Osmosis Unit HP5500D 1000 P
Twin pass high-purity water plant for dialysis in Australia
Reverse Osmosis Units 1200 UND 1600 D/E/B
Plants incl. break tank for high-purity water for dialysis patients in Georgia
Example RO series
Dead zone-free ultrapure water system for haemodialysis
Our hot-sanitisable double-stage RO units of the "HP5500D" series are compatible with dialysis machines of all well-known manufacturers. The units of this series reduce operating costs through a triple water saving strategy and high energy efficiency.
Advantages of the RO series "HP5500D"
+ Reduction of water consumption up to 35%*
Recirculation of the permeate from the circuit, adjustment of the concentrate flow in the 1st stage according to the current permeate consumption, and the return of concentrate from the 2nd stage to the break tank.
+ Disinfection at the push of a button
The complete reverse osmosis system for dialysis including the modules can be sanitised at a temperature of up to 90°C. Optionally, the entire system can be hot-cleaned in the same step. Herco confirms the quality as a medical product and hereby guarantees absolute safety for the treatment of patients.
+ Long lifetime
The stainless steel piping and a robust stainless steel base frame, as well as a leakage detection system and process-related alarm messages, ensure a long service life for the system.
+ Excellent ultrapure water quality
The double-stage design, the dead space-free construction and the possibility of thermal (chemical-free) disinfection result in excellent dialysis water quality.
+ Operating safety through monitoring
The storage and display of all relevant operating data, support and maintenance by the Herco service team and, last but not least, tested quality through the 'MDR Certificate' issued by TÜV SÜD Product Service GmbH.
* compared to conventional systems
Disinfection efficiency and energy efficiency
With the A0 value we reduce the energy needed for haemodialysis water treatment while at the same time ensuring disinfection efficiency
The reverse osmosis systems from Herco produce safe ultrapure water for dialysis machines. They meet the highest hygiene standards and work efficiently.
We focus on the following measures in our two-stage RO systems:
- The use of frequency-controlled pumps ensures the right pressure for hot cleaning
- Inline heaters only heat the amount of water which is actually required
- Optimal dimensioning and insulation of the ring pipes
- A0 value optimisation, i.e. hot cleaning is optimised to the desired A0 value
Conclusion: Compared to standard hot cleaning without A0 value optimisation, a high level of energy is consumed due to the continuous increase in temperature, while the hot cleaning systems with optimised A0 value consume significantly less energy due to the controlled heating and cooling mechanism (see graph).
Our systems for haemodialysis stand for
Water saving
Automatic controlled eco valve enables a yield of up to 99%.
Energy saving
A₀ optimized heat sanitization, reduces energy consuption drastically.
Smart reliability
Our dia2cloud service enables prodictive maintenance.
“We have been working with our reliable partner Herco Medical since 2016; with them we have realised two of our largest and most state-of-the-art dialysis centres in Ilion and Patra. Both are equipped with the latest technologies and thus offer the most widely known and most reliable dialysis treatments currently available. As always, collaborating with Herco was great.”
Serafeim Kyrkos, CEO Ariti S.A. Medical & Pharmaceuticals
Medical certificates
TÜV SÜD Product Service GmbH regularly audits our company. Below you can get an overview of our most important medical certificates and download them as PDF. You can also view the validity of our certificates for medical products directly on the TÜV SÜD Product Service GmbH homepage.
EC certificate MDR
Quality Management System for Medical Products - official confirmation that Herco as a manufacturer has established, documented and implemented a quality management system as described in Article 10 (9) of the Regulation (EU) 2017/745 on medical devices.
File format:
PDF / 295,0 KB
More water treatment expertise and knowledge
Dialysis media supply - Panel for single station
Herco Wassertechnik GmbH media supply panels for single dialysis stations set themselves apart thanks to elegantly designed, state-of-the-art components in the colour of your choice and a ready-wired electrical supply for each bed.
Dialysis media supply – Panel for double station
Herco Wassertechnik GmbH media supply panels for double dialysis stations set themselves apart thanks to elegantly designed, state-of-the-art components in the colour of your choice and a ready-wired electrical supply for two beds.
Dialysis media supply - connection system without dead zones
Conventional systems use branch lines to supply water to the dialysis machine. When the dialysis machine is not in use, the water in these dead-end branches remains stagnant at room temperature. The risk of germ multiplication increases with the time the system is not in use.
Loop without dead zones for dialysis
The loop without dead zones from Herco Wassertechnik GmbH for dialysis is made from plastic or stainless steel.
Thermally sanitizable reverse osmosis
You can only maintain a consistently high water quality if you regularly disinfect the entire water circuit, including the reverse osmosis unit.
Ultrapure water
Many water processes have special requirements for water purity and water treatment equipment.
Recent relevant articles on the topic
Herco at the ERA Congress 2025
From 4 to 7 June 2025, Herco Wassertechnik GmbH was present at the ERA Congress in Vienna. Every year, the congress brings together experts from all over Europe to discuss innovations in renal replacement therapy and nephrological research.
Herco medical at the Arab Health Exhibition 2025
Herco medical presented certified dialysis systems and made valuable contacts at Arab Health 2025 in Dubai. Many thanks to ‘THE LÄND’ and all visitors.
Herco Medical is at the Arab Health in Dubai
Herco Medical is at Arab Health in Dubai. Starting today. We cordially invite you to...
Questions and answers on the subject of dialysis water
Why is water so important for dialysis?
In haemodialysis, water comes into direct contact with the patient's blood via the dialysate. Highly purified water is therefore crucial for dialysis in order to ensure safe treatment and avoid health risks.
What does a reverse osmosis system do during dialysis?
A reverse osmosis system for dialysis (dialysis RO system) removes dissolved salts, organic substances, microorganisms and endotoxins from the raw water. It forms the centrepiece of every dialysis water system and ensures consistently high water quality and operational safety.
How is the quality of the dialysis water ensured?
Dialysis water quality is ensured by continuous monitoring, regular microbiological tests and documented disinfection cycles. Herco systems are designed to carry out these processes in an automated and fully documented manner.
What is dialysate preparation?
During dialysate treatment, the purified water is mixed with electrolytes and buffer substances. Safe and effective dialysis treatment is only possible by using highly purified water.
What are the advantages of a dialysis water system from Herco?
Herco develops water treatment systems that fulfil the highest hygiene standards, are energy-efficient and enable reliable dialysis operation thanks to automatic thermal disinfection.
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Thierry Demange
Account Manager for Medicine
thierry.demange@hercowater.com
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