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1. Prepare the solution in beaker glass and then pour it (±200ml) into the measuring glass 1000ml.
2. Turn on the aerator and the stopwatch in the same time.
3. Wait until the foam reaches the highest value on mark of measuring glass (1000 mL).
a. If the foam stops at a certain height for 90 seconds, turn off the aerator and the stopwatch and give the mark off the foam height.
b. If the foam reaches 1000 mL, turn off the aerator and the stopwatch in the same time.
4. Then reset the stopwatch into 0 second immediately and turn it on again to measure the time that foam needed until it reaches 0 mm (the lowest value). If the foam is no longer decrease till 5 minutes, give the mark for the foam height remain.
5. Measure the height of foam using ruler on black mark.