If the method does not state whether to use PVC or Duraprene tubing, is there a best pump tubing version to choose for QC8500?
Pump tubing version to choose
Several methods for Ammonia and TKN state to use PVC pump tubes to accommodate high levels of pressure on the lines. PVC pump tubes perform better than the Duraprene tubes under high pressure because they are more rigid. Phenol requires Duraprene pump tubes due to the possibility of phenolic compounds being leached out with the color reagents when using PVC tubes. The difference between Duraprene and PVC tubing when using most other methods is not noticable and Duraprene is often preferred because it generally lasts longer due to its elastic nature.