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Pipe Struvite Removal with RYDLYME

RYDLYME is extremely effective in struvite removal from piping and other affected equipment in wastewater treatment plants. The amount of RYDLYME required will be dependent on the severity of the struvite accumulation and the volume of the system to be cleaned. Please see this video for circulation and this video for static cleaning.

Typically, RYDLYME will be applied at 50-100% depending on the thickness of the struvite deposits to be removed. The preferred method of application is to circulate the RYDLYME solution through the pipe or equipment, but it can also be effective when utilized in a static or fill-and-soak application.

How to Remove Struvite from Wastewater Pipes

Apex highly recommends that, prior to cleaning, you contact us for technical assistance in determining the best dilution and method for removing your struvite scale deposits. For more information on how to remove struvite, click here.

  1. Obtain struvite deposit for testing with RYDLYME to confirm adequate concentration to dissolve struvite (typically 50-100%). Note the severity of struvite build-up. Obtain the current water volume of the struvite infected system as well as the designed water volume.
  2. To set up a circulation, connect the circulating pump inlet to the vented container via a hose.
  3. Run another hose from the pump outlet to the lowest accessible point of the struvite-infected system.
  4. Run another hose from the highest accessible point of the struvite infected system back to the vented circulating container.
  5. Add the prescribed amount of RYDLYME to the circulating container and turn on the pump to begin dissolving the struvite. Add water to the solution until a complete circuit is obtained.
  6. Continue circulation for 6-12 hours depending on struvite severity and volume of the system. Hourly monitor the RYDLYME solution to determine the endpoint. If RYDLYME is neutralized prior to the prescribed circulating duration, then more RYDLYME should be added in order to remove the remaining struvite. (See “Testing the Effectiveness of RYDLYME”)
  7. Upon completion of the struvite cleaning, rinse the system with clean water to remove any insoluble materials that may have been released from the struvite deposit.
  8. Return the system to service.



  • Biodegradable
  • Dissolves 2.2 lbs of scale per gallon of RYDLYME
  • NSF/ANSI 60 certified
  • Non-hazardous, non-corrosive and safe for personnel

What is Struvite?

Struvite is a naturally occurring crystal of magnesium, ammonium, and phosphate. A primary concern at wastewater treatment plants, particularly after anaerobic digesters release ammonium and phosphate from waste material that crystalizes into concrete-like deposits that can form on the downstream system components.

The formation occurs because you have magnesium from hard water, ammonia as a byproduct of urea and urine, and phosphate from the organic matter being processed, coming together in the plant’s system to form crystals that can deposit on pipe walls as well as on other components of the treatment system.

Struvite Removal Case Studies

Wastewater lift station pumps, valves and piping were severely clogged with struvite deposits. Hydroblasting for days achieved no results.

Thick deposits of struvite had accumulated on numerous centrifuges at a district wastewater treatment plant.