PUROTAP® total hard­ness mea­su­ring drops

1. Rin­se the titra­ti­on ves­sel with the sam­ple water to be ana­ly­sed and fill to the 5 ml mark.
2. Add the reagent solu­ti­on drop by drop while careful­ly swir­ling until the colour chan­ges from red to green. The colour chan­ge is rela­tively slow. The num­ber of drops requi­red cor­re­sponds to the total hard­ness in French degrees of hard­ness. (1 drop cor­re­sponds to 2° fH).
3. for water samples with low hard­ness, fill the titra­ti­on ves­sel to the 10 ml mark. (1 drop cor­re­sponds to 1° fH)

Note: If the water hard­ness is less than 1° fH, the sam­ple will turn green after only one drop of reagent has been added. Rin­se the titra­ti­on ves­sel with clean water after use.

1. Rin­se the titra­ti­on ves­sel with the sam­ple water to be ana­ly­sed and fill to the 5 ml mark.
2. Add the reagent solu­ti­on drop by drop while careful­ly swir­ling until the colour chan­ges from red to green. The colour chan­ge is rela­tively slow. The num­ber of drops requi­red cor­re­sponds to the total hard­ness in Ger­man degrees of hard­ness. (1 drop cor­re­sponds to 1° dH).
3. for water samples with low hard­ness, fill the titra­ti­on ves­sel to the 10 ml mark.
(1 drop cor­re­sponds to 0.5° dH)

Note: If the water hard­ness is less than 1° fH, the sam­ple will turn green after only one drop of reagent has been added. Rin­se the titra­ti­on ves­sel with clean water after use.