Define the water and separation duty
State the source water, active-basis dose calculation, coagulant sequence, separator and downstream process before comparing polymers.
A product that works in one water cannot be assumed to transfer to another turbidity, mineral or hydraulic condition.
Preserve a representative sample
Record sampling point, operating state, pH, temperature, turbidity or suspended solids, alkalinity, conductivity and upstream chemicals.
Mix the bulk sample consistently before splitting jars and retain the untreated reference.
Screen ionic profile and form
Compare coded anionic, cationic and nonionic candidates across plausible molecular ranges and powder or emulsion forms.
Charge information narrows the screen; measured clarification and downstream response decide the result.
Normalize preparation and dose
Keep active basis, stock concentration, water quality, aging, addition order and repeatable jar-test and plant mixing consistent for every candidate.
Unequal make-down or dose conversion invalidates a supplier comparison.
Measure the complete treatment result
Track treated-water turbidity or solids, settling behavior and downstream response, floc strength, separation rate, clarified-water quality, sludge volume and filter consequences.
Large visible floc is not sufficient if it breaks, carries over or shortens the filter run.
Release a bounded operating window
Link product code, lot, raw-water condition, dose basis, mixing, measurements, COA, SDS, packaging and quotation.
Revalidate after a meaningful water-source, coagulant, equipment, preparation or product change.
Separate chemistry from equipment faults
Check water change, sample handling, product identity, make-down, pump calibration, mixing and clarifier loading before changing the approved chemistry.
Change one controlled factor at a time and retain the accepted reference.
Close the technical and purchasing record
State the tested window, rejected conditions, field-trial plan, sample quantity, monthly demand, packaging, documents and destination.
Routine supply should match the traceable identity that produced the accepted result.
Keep product and active dose bases explicit
Keep three quantities separate: neat product dose, active polymer dose and prepared-solution feed rate. A product dose in milligrams per litre cannot be compared fairly when product concentrations differ. Convert every candidate to the same declared active basis, then record the stock concentration and sample volume used in the jar test. Preserve the calculation with the result so the selected dose can be reproduced.
For plant transfer, use actual water flow and confirm the units before calculating mass per hour. Convert the required product mass to volumetric pump rate using the supplied concentration or density where applicable. Check the result with a calibration column or timed draw instead of relying only on pump percentage. Recalculate after changing stock concentration, product form or flow signal.
Establish a measured low, normal and high review band. Underdose may leave pin floc and carryover; excessive polymer can produce fragile or sticky floc, residual polymer and unnecessary sludge. Move the setpoint only when water and treated-result data justify the change.
Keep raw measurements, rejected conditions and the accepted reference with the decision. Define who owns field confirmation, which changes trigger retesting and how later lots will be checked against the same process evidence. This closes the gap between an attractive laboratory observation and a repeatable water treatment program. Record the units, analytical method, reading time and operator for every acceptance result. When the source water or production state moves outside the tested envelope, return to a controlled comparison before changing the routine product or dose. Share the approved limits with operations, laboratory, purchasing and receiving teams so technical evidence follows the material through routine supply.