Define the purchasing requirement
Price per bag does not establish treatment cost. A buyer needs the delivered price, an agreed active-content basis and the dose that achieves the same accepted water quality. A cheaper powder can cost more to operate if it requires more product or creates avoidable preparation losses.
State the treated-water destination and the actual measurement used for acceptance. Keep untested water conditions outside the initial approval rather than extending a sample result to every future operating state.
Normalize the commercial offer
Compare currency, net product mass, package, destination and delivery term. Divide delivered cost per kilogram by the documented active fraction for an initial active-cost comparison. Do not assume every powder is entirely active polymer.
Separate freight, taxes where relevant, trial support and one-time equipment expenditure rather than burying them in a single unexplained quotation.
Use the measured treatment dose
At an active dose D in mg/L and active cost C per kg, chemical cost per cubic metre is D × C / 1000. For illustration only, D=0.2 and C=4 gives 0.0008 currency units/m³. This is arithmetic, not a recommended dose or selling price.
Verify the flow and feed calibration using the active-dose calculation record before relying on a small apparent saving.
Compare an equivalent output
Hold the source-water condition and coagulant sequence comparable. Include settled-water turbidity, filter response and residuals handling in the acceptance basis. Record preparation waste and rejected solution separately from useful polymer consumption.
A lower purchase price is meaningful only after the candidate passes the same downstream requirements and can be prepared consistently in the installed plant.
Resolve the limiting condition
A low-price candidate may meet settled-water turbidity but shorten filter runs. Evaluate the additional backwash and production consequences before awarding on chemical price alone.
Keep the incumbent or untreated reference in the comparison and record measurement timing. A repeat trial is preferable to a confident product ranking when observed differences are within sampling or instrument variability.
Record the release conditions
| Purchase check | Required evidence | Approval boundary |
|---|---|---|
| Price | Net mass, destination and term | Same delivered basis |
| Dose | Calibrated active mg/L | Common accepted output |
| Losses | Make-down and disposal record | Useful consumption visible |
Connect the accepted sample, commercial product code, preparation method and operating window. Preserve both failed and acceptable conditions so purchasing can distinguish a bounded recommendation from an unrestricted performance claim.
Request a focused proposal
Send both quotations, active-content documents, water flow, validated dose and filter results. Request a comparison that shows assumptions and uncertainty, not a guaranteed saving inferred from package price.
Send the water-treatment PAM sample and quotation request and review quality and delivery requirements with Gongyi Xinqi Polymer Co., Ltd.. Confirm the offered grade and documentation before placing an order.