• Using a pipette take 5ml samples in solution for 100ml flasks, small add 5 drops of 4 PP directive. and titrate with dd A5 (0.1N H2SO4) until the sample turned from pink to colorless. Ml dd A5 number used is the number of free alkalinity (F.Al). Often F.Al = 35 40 points.
• During the manufacturing process, freedom F.Al alkalinity decreases. To increase F.Al up 1 point to use about 1.5 kg LPCLEANER P28T for 1000L solution.
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