Treatment Technologies
Dialysis Water Treatment Companies
Hemodialysis water treatment solution providers delivering AAMI/ISO-compliant loops for clinics and hospital dialysis centers.
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Dialysis Water Treatment: AAMI/ISO 23500 Compliance for Hemodialysis
Dialysis water treatment supplies ultra-pure water for hemodialysis machines per AAMI/ANSI/ISO 23500-3 (formerly AAMI RD 62 and ISO 13959). Standard limits: bacteria <100 CFU/mL (alert), <50 CFU/mL (action); endotoxins <0.25 EU/mL (alert), <0.125 EU/mL (action); chemical contaminants per Table 1 (aluminum <0.01 mg/L, chlorine <0.10 mg/L, chloramine <0.10 mg/L, lead <0.005 mg/L, copper <0.10 mg/L, fluoride <0.20 mg/L, sodium <70 mg/L, sulfate <100 mg/L). Ultrapure dialysis fluid (UDF) per ISO 11663 demands <0.1 CFU/mL and <0.03 EU/mL for hemodiafiltration.
Standard treatment train: city water → backflow preventer → multimedia filter → activated carbon (2 carbon vessels in series with 6-minute EBCT each for chloramine removal — single carbon bed cannot meet AAMI continuously) → water softener → 5 μm cartridge filter → 1st-pass RO (95–98% rejection) → 2nd-pass RO or EDI → distribution loop with hot-water sanitization (≥85°C circulating, weekly schedule) and ultrafilter (0.04 μm) at each dialysis station inlet. Loop velocity ≥1.5 m/s prevents biofilm formation. Distribution piping: PVDF or PEX (not PVC which leaches plasticizers); avoid stainless steel chloride pitting at >250 mg/L Cl⁻ feed.
Monitoring per AAMI/ISO 23500: chlorine/chloramine at carbon outlet daily (limit detection 0.1 mg/L), conductivity continuous online, bacterial culture monthly (R2A agar, 5-day incubation at 17–23°C), endotoxin LAL test monthly, full chemical panel quarterly. Documentation: validated SOP, operator training records, calibration certificates, ISO 13485 medical device QMS, FDA 510(k) for systems sold in US. Aguato lists dialysis-water specialists serving hospital dialysis units, freestanding dialysis clinics, and home-hemodialysis equipment manufacturers.
Frequently Asked Questions
Why are two carbon vessels required for chloramine removal?
AAMI/ISO 23500-3 mandates two activated carbon vessels in series, each with empty-bed contact time (EBCT) ≥6 minutes (worker) and ≥10 minutes (polisher) at peak flow. Chloramine breakthrough is gradual and predictive monitoring of the first vessel is critical — chloramine residual >0.1 mg/L in dialysate causes hemolysis and methemoglobinemia in patients. Single-vessel configurations are explicitly non-compliant. Replace polisher when worker effluent exceeds 0.1 mg/L; rotate polisher to worker position and install fresh polisher. Test chloramine daily, immediately before each treatment shift.
What's the difference between hemodialysis water and ultrapure dialysis fluid?
Standard hemodialysis water per ISO 23500-3: bacteria <100 CFU/mL alert / <50 CFU/mL action, endotoxins <0.25 EU/mL alert / <0.125 EU/mL action — sufficient for conventional hemodialysis without back-filtration. Ultrapure dialysis fluid (UDF) per ISO 11663: bacteria <0.1 CFU/mL, endotoxins <0.03 EU/mL — required for hemodiafiltration (HDF), online HDF, and increasingly recommended for all hemodialysis per EBPG guidelines. UDF requires terminal ultrafilters (0.04 μm absolute) at each dialysis station, with replacement every 3–12 months per manufacturer specification.
How often should bacterial and endotoxin testing be performed?
AAMI/ISO 23500 minimum: bacterial culture monthly at every sample point (RO permeate, distribution loop return, dialysate machine inlet), endotoxin LAL monthly at same points. Best practice: weekly during commissioning and first 6 months; weekly bacterial culture at machine inlet quarterly thereafter; immediate sampling after any maintenance affecting distribution loop. Use R2A agar incubated 5–7 days at 17–23°C (TSA underestimates dialysis-water bacteria by 10–100×). LAL endotoxin test detects 0.005 EU/mL — required for ultrapure dialysate compliance verification.
What disinfection regime maintains AAMI compliance?
Two complementary regimes are used: thermal sanitisation at 85 degrees C or above circulating for 30 or more minutes weekly through the entire loop and machines (preferred for daily-use systems with PEX/PVDF piping rated for hot water), and chemical sanitisation with peracetic acid (0.5 to 1.0% for 30 minutes) or sodium hypochlorite (50 mg/L free Cl for 30 minutes) followed by complete neutralisation and rinse to below 0.1 mg/L residual, typically on a monthly schedule. Document time, temperature, and concentration for each cycle. Trend bacterial and endotoxin counts post-sanitisation to verify efficacy; failure to maintain compliance triggers root-cause investigation including biofilm presence on inner pipe surfaces.
A renal unit treating 140 patients per week was failing AAMI bacteriological action limits (above 50 CFU/mL) at 6 out of 32 machine inlet sampling points. Root-cause investigation identified a 12-year-old distribution loop with corroding stainless steel sections, dead legs at decommissioned stations, and a single activated carbon vessel providing inadequate chloramine removal during high-demand periods.
The distribution loop was repiped in PVDF with elimination of 8 dead legs. Two activated carbon vessels in series were installed (EBCT 8 minutes each). The existing RO was retained but a second-pass RO module was added to improve bacterial rejection. Thermal sanitisation at 85 degrees C was implemented weekly with documented validation. Six ultrafilters (0.04 micron) were added at the highest-risk machine inlet points.
AAMI bacteriological counts fell to below 5 CFU/mL at all 32 sampling points within 6 weeks of recommissioning. Endotoxin results were below 0.06 EU/mL (well below 0.125 EU/mL action limit). The CQC inspection following the upgrade noted no water quality concerns. The patient care regulatory risk was eliminated without any downtime during active patient treatment sessions.
Questions to Ask Shortlisted Providers
- 1
Do you propose two activated carbon vessels in series, each with EBCT of at least 6 minutes, and how is chloramine breakthrough monitoring implemented?
AAMI/ISO 23500-3 mandates two carbon vessels in series as the minimum standard. A single vessel with EBCT below 6 minutes cannot guarantee chloramine below 0.1 mg/L at all times. Vendors who propose a single carbon vessel or combined vessel with inadequate contact time are providing a non-compliant design that creates patient safety risk.
- 2
What distribution loop material do you specify and how do you eliminate dead legs at unused sampling points and machine connections?
Stainless steel distribution loops in dialysis units corrode at weld points, releasing iron that promotes biofilm growth. PVDF is the current best practice material. Dead legs (pipe sections above 6D in length with no flow) are biofilm reservoirs that cannot be sanitised effectively. Any proposed design must eliminate dead legs by design, not by periodic flushing.
- 3
What is your documented thermal sanitisation protocol and how is loop temperature verified at the most remote point?
Thermal sanitisation at 85 degrees C must reach the most remote point of the distribution loop, not just the supply header. Vendors should specify thermocouple positions, minimum contact time at the most remote point, and the validation record format required under MHRA GMP and ISO 13485.
- 4
What is your equipment's CE marking and ISO 13485 certification scope, and what regulatory documentation do you provide for NHS commissioning?
Medical-device water treatment systems for dialysis use require CE marking and ISO 13485 quality management system certification. NHS engineering departments require documented installation qualification (IQ), operational qualification (OQ), and performance qualification (PQ) protocols before commissioning the system for patient use.
- 5
What ongoing service contract do you offer and what response time do you guarantee for emergency bacteriological action-limit exceedances?
A dialysis unit cannot operate safely if bacteriological action limits are exceeded. An emergency response within 4 hours for action-limit exceedances, with defined corrective actions including immediate sampling, bypass options, and temporary ultrafilter installation, must be part of any service contract for a clinical dialysis water system.
What Drives Cost in This Category
Repiping a 32-station dialysis unit loop in PVDF costs GBP 80K to GBP 180K versus GBP 50K to GBP 100K for 316L stainless steel. PVDF's 30 to 50% capital premium is consistently justified by lower long-term biofilm risk and elimination of stainless corrosion-product contamination that triggers AAMI non-compliance events.
Single-pass RO for dialysis water costs GBP 25K to GBP 60K for a 32-station unit. Second-pass RO adds GBP 15K to GBP 35K but improves bacterial rejection 10-fold and reduces TOC leakage, significantly improving bacteriological compliance at machine inlet points. EDI is rarely used in dialysis applications; the cost is disproportionate to the marginal quality improvement over second-pass RO.
Ultrafilters at each dialysis machine inlet (0.04 micron, GBP 300 to GBP 800 each) add GBP 10K to GBP 25K for a 32-station unit. Replacement every 3 to 12 months at GBP 10K to GBP 20K/year is a recurring cost. However, ultrafilters at machine inlets are mandatory for hemodiafiltration (HDF) and strongly recommended for ultrapure dialysis fluid, both of which are becoming clinical standard.
Producing installation, operational, and performance qualification documentation to NHS and ISO 13485 standards adds GBP 5K to GBP 20K to commissioning costs. Facilities without this documentation face extended time to clinical commissioning approval, potentially delaying patient treatment by 4 to 12 weeks.
Key Regulations & Standards
The primary standard governing dialysis water quality, treatment train requirements, monitoring protocols, and quality management for all haemodialysis and hemodiafiltration applications. Compliance is mandatory for CQC registration of dialysis units in England and is audited during CQC inspections.
Dialysis water treatment systems are classified as medical devices. Manufacturers and service organisations must hold ISO 13485 certification demonstrating a quality management system covering design, manufacture, installation, and servicing. NHS trusts should verify current certification scope at contract award.
CQC inspects renal units against Fundamental Standards including safe care (Regulation 12). Water quality non-compliance creating patient safety risk (bacteriological or endotoxin exceedances) triggers CQC enforcement action. CQC has issued improvement notices to dialysis units following AAMI bacteriological action-limit failures.
Clinical dialysis units producing ultrapure dialysis fluid (HDF) that exceeds standard AAMI limits must apply MHRA GMP principles for water used in manufacturing medicinal products in clinical settings. This includes validated processes, controlled change management, and documented batch records for each sanitisation cycle.