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From Source to Dialyzer: The Journey of Water in a Dialysis Unit

by Rio Ocampo
Dialysis Machine

Photo from American Kidney Fund

Stage 1: Feed Water — The Starting Point
The process begins with municipal or deep-well water, which may contain impurities such as sediments, chlorine, and dissolved minerals. Before entering the dialysis circuit, this water must be purified to protect both the system and the patient.

Stage 2: Pre-Treatment
Through multimedia filtration, activated carbon, and softening units, the feed water is stripped of particulates, chlorine, and hardness. The initial conditioning phase ensures the reliability and longevity of downstream components.

Stage 3: 2 Pass Reverse Osmosis (RO)
At the heart of the system, reverse osmosis employees semi-permeable membranes to remove up to 99% of dissolved ions, organics, and other contaminants, producing high-quality permeate water suitable for dialysis applications.

Stage 4: Deionization/Electrodeionization (EDI)
To achieve ultrapure quality, the RO permeate is “polished” through deionization or EDI systems, which remove remaining ionic traces, achieving the conductivity levels mandated by dialysis water standards.

Stage 5: Distribution Loop
Purified water circulates continuously within a sanitized distribution loop, maintaining consistent quality as it is continuously filtered through an ultrafilter & UV preventing stagnation and biofilm formation until it reaches the dialyzer.

Delivering Life-Saving Purity

Every stage in this process is vital not just for compliance, but for the protection and well-being of every dialysis patient. A well-designed system will ensure >99.99% (log 4) bacteriological removal. 

Is Your Dialysis Center’s Water System Safe, Compliant, and Reliable?

Hemodialysis requires ultra-pure water to ensure patient safety and equipment longevity. Any compromise in water quality 
can lead to serious health risks and costly operational downtime.

Whether you’re starting a new facility or upgrading an existing one, we provide specialized water
treatment solutions tailored to dialysis centers. Our systems are built to meet DOH standards 
and ensure uninterrupted, safe treatment—even during supply disruptions.

Ready to take the next step? Fill out our contact form and let our experts guide you toward a 
safer, more reliable water solution for your dialysis operations.