Silica HR [P0₄ or Cl₂]

Photometric test for Silica (high range) in natural and treated water (corrected for phosphate and chlorine interference)

Fill to the 10 mL line with sample.

Use this to "blank" the instrument. Place in cell holder and press Blank.

Prepare sample by adding a Silica HR No1 tablet and crush and stir.

Then, add a Silica HR No 2 tablet and crush and stir.

Wait 10 minutes to allow colour development.

Then, add a Silica PR tablet and crush and stir.

Place in the cell holder and press Measure.

Allow timer to count down 2 minutes. The concentration of Silica will then be displayed.