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Fill to the 10 mL line with sample.
Use this to "blank" the instrument. Place in cell holder and press Blank.
If sample contains Silica above 20 mg/L, add a Phosphate SR tablet and crush. Otherwise, skip to next step.
Add a Phosphate HR Tablet and crush and stir.
Place in the cell holder and press Measure.
Allow timer to count down 10 minutes. The concentration of Phosphate will then be displayed.
