How Drain Re-Lining Works

Ontario Pipe Lining uses Nu Flow because it is the most advanced drain re-lining technology on the market to repair small diameter sanitary and storm pipes. Learn more about these patented products below.

Incorporated in 1998, Nu Flow is an industry leader in epoxy lining and coating, holding over 21 patent technologies to help repair and renew pipes and trenchless sewer. Nu Flow is the only North American company that offers manufacturing, installation and training on its innovative products.

Left: Failing cast iron drain pipe Right: Re-lined piece of cast iron using Nu Drain technology

Nu Drain

Nu Drain is a non-destructive, patent-protected structural lining process from Nu Flow. 

Where can Nu Drain be used?

  • Mains, Horizontal Laterals, Vertical Stacks
  • Sanitary Systems
  • Storm/Roof Drains
  • Vent Systems
  • Other Waste Systems

There are two installation techniques for CIPP:

1) Inversion which follows the design standards of ASTM F1216 and

2) Pull-in-Place which follows the installation methods of ASTM F1743 and the design standards from ASTM F1216.

What makes Nu Drain unique is that the patented internal bladder system is made with rubber, which allows great versatility and control when dealing with complex bends and pipe configurations (i.e. 90 degree bends). Nu Drain can navigate up to 270 degrees of bends before requiring more direct access to the drainage system.

The cured-in-place pipe (CIPP) restoration process restores old and corroded piping systems without the labour of removing the entire pipes, allowing you to save on labour costs while ensuring the longevity of your piping systems. With no digging and destruction of the building required, this means less downtime, displacement or distraction to worry about, so it’s business as usual for you!

Nu Drain has been approved for restoring piping systems made from clay, concrete, metal, iron steel, PVC and fiberglass, and is best suited for pipes that are 1.5“ to 12” in diameter.

The Process Simplified

Step 1 – Pipe Cleaning

  • A camera inspection is conducted to locate the cause of failures and identify corroded weak spots
  • Use pneumatic tools to clean the pipes

Step 2 – Pipe Lining

  • Installation using existing access points
  • Post camera

Step 3 – Bladder Removal & Evaluation

The Result

  • Increase flow rate
  • Elimination of weakened joints
  • Sealed cracks
  • Reduced chance of groundwater pollution

How it Works

  1. The pipe is investigated with a CCTV camera, the condition is observed, diameter and length are noted, and the configuration is outlined. Contact us for a quote to investigate your kitchen stacks and main sanitary drain and get your condition assessment completed today.

  2. Pipe is cleaned (not flushed).

  3. Pipe is re-inspected with CCTV camera and lengths, connections and diameters are reconfirmed prior to lining the pipe. Liner measurements taken and transferred from camera reel to liner onsite.

  4. Epoxy (VOC-free) is mixed onsite and poured into the liner and the liner is impregnated with epoxy.

  5. Liner is inserted via a single-entry point or pulled into place using a downstream access point. The bladder is inflated. The liner is cured-in-place (CIPP), and once cured, the bladder is removed and the pipe is put back together and can immediately be put back into service.

  6. Final video inspection is completed.



    Final video inspection is complete. Nu Flow’s Nu Drain was first to use the light blue liner because it can easily be identified on post-lining videos.


    Final video of Vertical/Horizontal Connection Liner (VHCL).

    For more information on Nu Flow’s Vertical/Horizontal Connection Liners please contact us.

ICC-ES PMG Product Certified

The ICC evaluated Nu Drain against Division 22 00 00 – Plumbing Section 22 13 16 – Sanitary Waste and Vent Piping. The Nu Drain product holds its product certificate based on several factors: 

1) ASTM F1743 is a consensus standard but not referenced in the code.

2) The code prohibits drainage line size reduction in the direction of flow. Nu Drain installation does not constitute a reduction to a smaller nominal pipe size. Further, the resulting surface affords less friction loss, which provides equivalent flow capacity despite the small reduction in diameter.

3) The use of this system restores the treated pipe capacity to minimum requirements in the code.


Have a question about how Nu Drain works or how to get started? Contact us today!