Check identity before opening the package
Match the supplier, product code, batch identification and quantity against the order and packing list. Inspect package condition. Segregate discrepancies for review rather than treating them as paperwork that can be resolved after the material enters production.
Confirm that the COA refers to the delivered lot. Compare reported values with the agreed limits and applicable methods. A broadly similar trade name does not authorize substitution. Record who reviewed the discrepancy and who approved the final disposition.
Use a controlled operational comparison
Where the process warrants an incoming performance check, use an agreed method and representative feed. Compare with retained approved material when available and suitable. Keep preparation and dose basis consistent so the result can distinguish material response from test variation.
Do not define acceptance from a single visual observation. A batch may appear to make larger floc while worsening capture or handling. Select the same meaningful endpoints used during qualification and document any changed plant conditions.
Investigate before assigning the cause
If response changes, preserve the product code, lot reference, storage history, preparation record and process data. Check whether feed, water quality, equipment or upstream treatment changed at the same time. Avoid consuming all suspect material before the issue can be reviewed.
Discuss retention sampling, storage and investigation arrangements with the supplier and plant quality team. Follow the product handling instructions. An uncontrolled sample or missing chain of identification can make later comparisons inconclusive.
Define which changes require notice
Agree how changes in grade code, release specification, manufacturing arrangement, packaging or preparation instructions will be communicated. Decide which changes trigger document review and which require renewed application approval. Do not assume silence means an unchanged product.
Keep the change record with factory qualification evidence and the approved sample record. Written acceptance rules give purchasing and operations a shared basis for reordering, holding or requalifying a material.