Describe the hydraulic path
List pipe sizes, lengths, restrictions, manifold and target rate.
Geometry and flow regime define the pressure question.
Verify instrumentation
Confirm differential-pressure range, sampling frequency and calibration.
Unstable sensors can overwhelm chemical differences.
Compare at matched flow
Use the same water, temperature, equipment and condition for every candidate.
Do not compare percentages from different loops.
Measure response speed
Record time from injection to stable pressure benefit.
Fast field demand may favor a different formulation.
Test shear exposure
Sample before and after critical pumps or restrictions where practical.
Separate hydration failure from mechanical degradation.
Approve a controllable window
Choose stable response across a bounded addition and water range.
Define operator monitoring and stop conditions.