All bulk loads are tested at the time of delivery from the manufacturer to ensure the Urea content is within the specified range when it arrives at our shop.  Each of these bulk loads can be traced back to the original railcar with Certificate of Analysis (C.O.A.) if requested.  Our Diesel Exhaust Fluid is manufactured to ISO 22241 specifications, and is API certified.
If a problem is suspected with DEF supply a sample can be sent to an independent laboratory for analysis.   In the years we have been in business supplying Diesel Exhaust Fluid Chemstream has never had a Quality issue with our DEF supply to our customers.