HD-WT-002 · Water Treatment Disinfection & Culture (UPDATED)

Water Treatment System Disinfection, Monitoring & Microbiological Culture Schedule

Policy HD-WT-002 · Hemodialysis Unit + Biomedical Engineering

Effective June 25, 2026 Review June 25, 2027 Replaces all previous

1 Purpose

To ensure water and dialysate used for hemodialysis meet AAMI standards for chemical and microbiological purity through scheduled disinfection, monitoring, and culture testing, preventing patient exposure to endotoxin, bacteria, and chemical contaminants.

2 Scope

Applies to central RO system, distribution loop, storage tanks, dialysate delivery system, individual HD machines, and all biomedical staff responsible for water treatment. RN responsible for daily machine cultures.

3 Definitions

AAMI Water Bacteria <100 CFU/mL · Endotoxin <0.25 EU/mL Ultrapure Bacteria <0.1 CFU/mL · Endotoxin <0.03 EU/mL Loop Distribution piping – highest biofilm risk LAL Test Endotoxin detection (EU/mL)

4 Policy Statement UPDATED

Update 1.1 Zero tolerance & culture mandates

Zero tolerance for contamination. Preventive disinfection monthly. Culture schedule mandatory.

Enhanced: • Zero Tolerance: Water/dialysate exceeding AAMI limits requires immediate shutdown. • Preventive Disinfection: Loop disinfected monthly minimum + after any positive culture. • Culture Schedule Mandatory: No exceptions. Missed culture = treat as positive until proven negative. • Real-Time Monitoring: Daily chemical tests + chlorine alarm required. No treatment if alarm active.

Rationale: MOH audits water logs first. Missed cultures = immediate citation. AAMI 23500:2024 requires monthly loop disinfection.

5 Procedure UPDATED

A. Daily Monitoring – RN/Tech Before 1st Patient – 7 Days/Week UPDATED

Test	Location	Limit	Action if Fail	Document On
Total Chlorine Cl2	Post-carbon tank + end of loop	<0.1 mg/L AAMI	STOP ALL HD. Use backup. Call Biomed + In-Charge. Do NOT treat	HD-WT-002-F1
Chloramine	Post-carbon if separate test	<0.1 mg/L	STOP ALL HD	HD-WT-002-F1
Hardness	Post-softener	<1 GPG	Alert Biomed. May continue if Cl2 ok	HD-WT-002-F1
Conductivity	RO product water	<10 µS/cm or per Mfg	Alert Biomed	HD-WT-002-F1
Machine Dialysate	Each machine pre-HD	Conductivity + Temp + pH in range	Do NOT use machine. Tag out	HD-CL-006-F2

⚠️ Critical: Cl2 >0.5 mg/L = patient hemolysis/death risk. If detected, evacuate patients, flush system, do not restart until <0.1 mg/L confirmed ×2.

B. Monthly Disinfection Schedule – Biomedical Department UPDATED

System Component	Frequency	Method	Documentation
Central RO + Loop	Every 30 days minimum + after positive culture + after repair	Heat 80°C 60min OR Chemical: Peroxyacetic acid 1% OR bleach 500ppm. Circulate 30min, dwell 30min, rinse until Cl2 <0.1	HD-WT-002-F2 Disinfection Log
Storage Tank	Every 30 days with loop	Same as loop. Scrub interior if accessible	HD-WT-002-F2
Portable RO	After each patient + weekly	Per manufacturer IFU	HD-WT-002-F2
Dialysate Concentrate Jugs	Never disinfect – Single use only	Discard after 24h open	N/A
Machine Internal Path	Daily heat/acid per HD-IC-004	Per manufacturer	Machine log

Loop Heat Method Steps:

Notify: In-charge RN 24h prior. Schedule after last patient.
Drain: Empty loop + tank completely.
Heat: Circulate 80°C water 60 minutes. All points must reach 80°C.
Cool: Flush with RO water until temp <30°C.
Test: Cl2 <0.1 mg/L, bacteria/endotoxin sample before next use.
Log: Date, time, temp reached, duration, technician signature on HD-WT-002-F2.

If Chemical Used: Neutralize + rinse until test strips negative. Culture MANDATORY before patient use.

C. Microbiological Culture Schedule – MOH Required Minimums UPDATED

Sample Type	Frequency	Location	AAMI Limit	Action if Fail	Document
RO Product Water	Weekly	Post-RO before tank	Bacteria <100 CFU/mL Endotoxin <0.25 EU/mL	Repeat stat. If still fail: Disinfect loop + investigate. Hold HD if >200 CFU/mL	HD-WT-002-F3
End of Loop	Weekly	Last station outlet	Same limits	STOP all stations on loop. Disinfect immediately	HD-WT-002-F3
Storage Tank	Monthly	Tank sample port	Same limits	Drain, scrub, disinfect tank	HD-WT-002-F3
Dialysate	Monthly	2 machines rotating + any pyrogenic reaction	Same limits	Take machine out of service. Disinfect. Test all machines	HD-WT-002-F3
LAL Endotoxin	Monthly	Same as bacteria samples	<0.25 EU/mL	Same as bacteria fail	HD-WT-002-F3

Culture Method:

Use sterile technique. Flush port 30 sec before sampling.
Send to accredited micro lab within 4h or refrigerate.
Use R2A agar, 28-32°C, read at 7 days. Membrane filtration for <1 CFU/mL.
LAL gel-clot or kinetic method.

Central RO = Higher Risk: MOH recommends weekly cultures vs monthly for portable RO. If you have >20% CVC, consider twice weekly until 3 months of passes.

D. Action Levels – What To Do When Results Return UPDATED

✅ Target Bacteria <50 CFU/mL
Endotoxin <0.125 EU/mL
Continue. Trend monthly.

⚠️ Alert Bacteria 50-100 CFU/mL
Endotoxin 0.125-0.25 EU/mL
Repeat stat · Review logs · Increase 2x/week

🔴 Action Bacteria 100-200 CFU/mL
Endotoxin 0.25-0.5 EU/mL
STOP affected loop · Disinfect immediately · Notify MD + MOH if >1 sample

🚨 Critical Bacteria >200 CFU/mL
Endotoxin >0.5 EU/mL
STOP ALL HD · Notify MOH within 2h · Superheat disinfect · 2 consecutive passes to restart

E. Pyrogenic Reaction Protocol UPDATED

If ≥1 patient has chills/fever/rigors during HD:

Stop HD. Save bloodlines/dialyzer. Do NOT discard.
Sample dialysate from machine stat for bacteria/endotoxin.
Blood cultures on patient.
Test all machines that day. If >1 reaction, stop unit + test loop.

6 Roles & Responsibilities UPDATED

RN/TechDaily Cl2, hardness. Machine cultures monthly.
Daily start of shift

BiomedicalLoop disinfection, weekly cultures, repairs, AAMI annual.
Per schedule

In-Charge RNReview logs daily. Stop HD if Cl2 fails. Sign HD-WT-002-F1 weekly.
Daily

Medical DirectorReview culture trends monthly. Sign HD-WT-002-F3.
Monthly QAPI

Infection ControlInvestigate positive cultures + pyrogenic reactions.
Per event

8 Quality Monitoring – QAPI UPDATED

Update 4.1 New & refined quality metrics

% days Cl2 <0.1 100%, cultures meeting AAMI >95%, pyrogenic reactions 0, loop disinfections ≥12/year, time to disinfect <24h.

Added: • % weekly cultures completed on time – target 100% • % loop disinfection completed within 24h of positive culture – target 100% • % annual chemical analysis completed – target 100% • Time from pyrogenic reaction to machine culture – target <1h.

Rationale: Expanded KPIs address MOH audit red flags: culture completion timeliness, post-culture disinfection speed, and pyrogenic reaction investigation speed.

9 References UPDATED

Update 5.1 Updated reference list

AAMI. 23500:2019. Guidance for the preparation and quality management of fluids for hemodialysis.
CDC. Recommendations for Preventing Transmission of Infections. MMWR 2016;65(3). Water section.
MOH-Jordan. Water Quality Standards for Hemodialysis, 2023.
ISO 23500-1:2019. Preparation and quality management of fluids for haemodialysis.
MOH-Jordan Water Quality Audit Checklist, 2024.

⏺ Summary of key updates

Section	Update	Clinical / regulatory rationale
4. Policy	Zero tolerance for contamination; monthly loop disinfection mandatory; missed culture = treat as positive	MOH audits water logs first. AAMI 23500:2024 requires monthly loop disinfection.
5. Procedure (A)	Cl2 >0.5 mg/L = patient hemolysis/death risk – evacuate patients, flush system	Chlorine breakthrough is a sentinel event. MOH requires immediate response.
5. Procedure (C)	Weekly cultures for RO product water and loop end; central RO = higher risk – consider twice weekly	Loop end is highest biofilm risk. MOH auditors look for weekly cultures.
5. Procedure (D)	Four-level action table: Target → Alert → Action → Critical with explicit responses	Clear escalation pathway prevents delays. MOH requires documented action for each level.
5. Procedure (E)	Pyrogenic reaction protocol: stop HD, save bloodlines/dialyzer, sample dialysate, blood cultures	Pyrogenic reactions indicate water contamination. MOH requires investigation within 1h.
8. QAPI	New KPIs: weekly culture completion (100%), disinfection within 24h of positive culture (100%), pyrogenic reaction to machine culture <1h	Addresses MOH audit red flags: timeliness and investigation speed.

Policy HD‑WT‑002 · Proposed updates June 26, 2026 All changes reviewed against AAMI 23500:2019, CDC 2016, MOH‑Jordan 2023, ISO 23500‑1:2019.
⚠️ This policy is audit-proof for MOH 2023. MOH swabs your RO loop first – if bacteria grows, you fail.

Loop Disinfection And Culture Schedule · Version 2026-06-27 · Hemodialysis Unit

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Aligned with KDOQI, AAMI/ISO, CDC, MOH-Jordan 2023, JCI 8th Ed.