NuFlow Serline is the faster and more affordable way to safer drinking water.

Certified to NSF/ANSI 61 Standard

There are an estimated 7 to 10 million lead service lines (LSLs) currently in use in North America, impacting over 10 million families.

Rehabilitating LSLs with the Serline solution can be three times faster and cost 1/3 less than replacement.

The Serline process is faster and costs less than conventional pipe replacement, the 2-hour cure time means same day return to service, and a comprehensive audit trail provides quality assurance and peace of mind.

Group 8396

The Serline process features a NuFlow-developed polyurethane-polyurea hybrid resin.

The flexible resin coats the inside of lead pipes, creating a barrier between the lead pipe and the water. The resin also spans small defects, thereby reducing leakage and improving pressure and flow characteristics.


Clean and line with a single rig


Precise and even resin distribution


2-hour return to service


10+ service lines per crew/day


Less excavating than replacement

Ask your account manager

More than 13,000 lead service lines worldwide have been rehabilitated using the Serline process.

+1 (800) 834-9597


LSL Conventional vs. Rehabilitation Using Serline

Open Cut 1-2/Crew/Day Surface Conditions, Soils
Pipe Splitting/Pulling 2-6/Crew/Day Pipe Layout, Soils, Other Utilities
Serline Resin Lining 4-12/Crew/Day Lines Greater Than 2” I.D.


There are options available when it comes to lead remediation, but when community health is at risk, speed is absolutely critical. The good news is when it comes to safeguarding our water, speed actually costs less.

Cost Comparison Serline vs. Conventional

Street cut, Jack Hammer on Skid Loader, Spoils Disposal $510 $510
Excavate to Depth (Corporation Stop) (Vacuum or Backhoe) $500 $500
New Corporation Tap $300 $300
Excavate to Depth (Curb) (Vacuum or Backhoe) $300 $300
New Curb Stop $150 $150
Labor Pipe work (Master Plumbet, Apprentice) $450 $450
Street Repair (rock, compaction, Concrete with Asphalt lifts) $600 $600
Consulting Engineer / Project Management $1,000 $1,000
City/Water/Streets/Building Administration & Emergency Fee $1,000 $1,000
Baseline Cost for All Rehab/Repipe Techniques per line $4,810 $4,810
Serline vs. Replacement $1,000 $5,000
Total per line $5,810 $9,810

Assumptions: Costs are estimated on a program approach with 100's being executed per month. All techniques will require a minimum of 2 pits, the corporation and curb stop to be replaced. Note that excavation pits for polymeric pipe coating are considerably smaller than other trenchless methods.



The Serline process features a NuFlow-developed polyurethane-polyurea hybrid resin. The flexible resin coats the inside of lead pipes, creating a barrier between the lead pipe and the water. The resin also spans small defects, thereby reducing leakage and improving pressure and flow characteristics.

Rigorously Tested for Peace Of Mind

Serline 266L has been certified as meeting the rigorous requirements for compliance with NSF 61, Drinking Water System Components - Health Effects. NSF 61 applies to products that create barriers to isolate drinking water or prevent its contact with other surfaces, and was developed to assess the potential migration of contaminants from materials or products into drinking water.

  • Certified to NSF/ANSI 61 Standard
  • Low toxicity, aliphatic polyisocyanate based composition
  • Polyurethane/polyurea hybrid, no corrosive constituents
  • Quick curing time; pipes return to service after 2 hour
  • Projected lifespan of 50 years+
  • Suitable for diameters as small as 1/2″ ID
  • Scientifically engineered for optimal application in lead pipes

The Serline Process

Automation, Repeatability, and Traceability

The Serline process cleans and lines pipes with a single rig utilizing a computer-controlled air vortex system designed to remove human error from the process. The pipes are cleaned by introducing a mildly abrasive aggregate into the air vortex, cleaning and smoothing the inside surface of the pipes. A measured volume of resin is then introduced into the system, through a process that is fully automated to maintain quality control.


No disruption to other utility service lines


Apply to a variety of pipe materials


Operators assessed and certified by independent 3rd party


Rig independently certified prior to each contract



The lining process is driven by a state-of-the-art computer controlled and monitored system. Air flow, temperature, moisture content, pressure, weight, time duration, and other values are pre-programmed and calibrated based on the diameter of the service line, the length of the line, and the coating material being applied. The system will only start the coating process when all conditions have been met, and any variances that arise will sound an audible alarm and prevent or interrupt the lining process until all parameters are within established limits.

  • System ensures even thickness and lining coverage
  • Automated application ensures consistent application
  • Cleaning and lining take about 15-20 minutes per service line
  • 10+ service lines completed per crew/day


Computerized reports of each lining are available immediately after application and can be automatically sent to stakeholders (water district, engineers, project manager, etc.). This report tracks all actions completed during the rehabilitation process, with a time and date stamp per activity:

  • Specific site address
  • Length, diameter and type of pipe being treated
  • Flow rate before and after cleaning
  • Temperature of pipe material
  • Rig and operator identification numbers
  • Amount of resin applied


The Serline solution was developed in conjunction with utilities in order to provide safe application in a timely manner. Excavations and decommissioning, lining, and recommissioning can be handled by separate teams maximizing the number of linings per day, and the two-hour return to service time minimizes disruption to consumers.

Lead Pipe Lining Case Study

  • 3,000 Lead Pipes Lined
  • 3 Times as Fast.
  • Half The Cost.

NuFlow’s parent company Aquam undertook an ambitious program of in-place lead service pipe lining for Yorkshire Water in Rotherham, United Kingdom. The project rehabilitated lead pipes at 1,000 properties and included over 3,000 lead pipe linings. Most impressive of all, the project was completed in just 14 weeks – that’s 3 times faster than pipe replacement and for half the estimated cost.

Crews worked ahead of the lining teams, excavating and decommissioning lines. They also set up water bypass lines to maintain water service. After the lining, a second crew followed up, flushing, recommissioning, backfilling and making repairs. The “assembly line” system maximized efficiencies and enhanced the speed of the project.


Properties improved


Lead pipes lined


Project duration




Begin the path to new expertise, product offerings, and revenue streams. NuFlow technicians are highly-qualified educators and can offer the industry expertise, guidance, and resources to help you start installing state-of-the-art NuFlow products in no time.


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