Upstream ferric conditioning changes the feed presented to a polymer trial. Buying cationic polyelectrolyte for that stream requires a controlled chemical baseline; it is not a reason to assume a universal charge requirement.
Record what reaches the polymer point
Identify ferric product, addition stage, dose convention, pH and mixing history. Include other additives and whether inorganic solids materially change the total dry-solids basis. Compare samples from the actual polymer injection route rather than untreated sludge taken at a more convenient location.
Hold the first treatment fixed
Compare cationic grades with upstream conditioning stable. If ferric dose or pH must change, treat that as a separate staged experiment. The product-function guide distinguishes the purposes without suggesting that coagulant and flocculant are automatically interchangeable.
Check combined consumption and cycle value
Retain both chemical uses, matched dry-solids calculations and machine results. A lower polymer demand may not reduce total operating cost if inorganic addition or disposal mass rises. For filtration, evaluate pressure development, filtrate, cake and release rather than one favorable early-drainage observation.
Define the accepted sequence
Attach the tested ferric and polymer sequence to the procurement approval. Changes upstream can invalidate a previous grade or dose window without proving a defective polymer lot. Keep the accepted sample, operating record and a requirement to recheck material changes before broad repeat supply.
Keep the purchase tied to evidence
Record the candidate code, sample lot, sludge condition and measurement method beside each result. An untested condition is a qualification limit, not an assumed pass. Keep unresolved requirements visible before approving repeat supply.
| Requirement | Evidence | Purchasing decision |
|---|---|---|
| Baseline | Ferric dose, pH and sequence | Polymer comparison is controlled |
| Mass basis | Total solids and both chemicals | Consumption is interpreted correctly |
| Acceptance | Machine and combined-cost results | Award fits the actual treatment train |
Request a defined sample and quotation
Provide the upstream ferric recipe and addition point, solids basis, equipment cycle and current polymer. Mark whether the intention is polymer replacement or a separately authorized combined-chemistry trial.
Include quantity, delivery destination and requested documents with the sample brief. The quality and supply record connects the qualified product to shipment. Gongyi Xinqi Polymer Co., Ltd. can review the operating case and commercial request; confirm grade-specific availability and terms before ordering.
Request a product and purchasing review
Send the sludge, equipment and supply requirement for the intended duty.