VISOCOLOR® ECO Swimming pool
Colorimetric determination of chlorine and pH-value
Free chlorine reacts with N,N-diethyl-1,4-phenylene diamine (DPD) to form a red-violet dye. The pH value is determined with phenol red as indicator.
For test kits for the determination of chlorine alone see VISOCOLOR® Chlorine.
|Data and ordering information|
|Cat. No.||931 090 (931 290)|
|Type||colorimetric test kit (refill pack)|
|Range||< 0.1 · 1 · 0.2 · 0.3 · 0.4 · 0.6 ·
0.9 · 1.2 · 2.0 mg/l Cl2
pH 6.9 7.2 7.4 7.6 7.8 8.2
|Sufficient for||150 determinations|
|Shelf life||at least 18 months|
|Sea water suitability||yes|
|Detectable with PF-11||pH: no; Cl2: yes|
Chlorination of water in swimming pools with chlorine or chlorine compounds takes place within certain limits. One distinguishes between free chlorine and bound chlorine (chloroamines); the sum of both is called total chlorine. The content of free chlorine should be between 0.3 and 0.6 mg/l. Chlorination alters the pH value of the swimming pool water. The ideal pH value is pH 7.4. This prevents formation of malodorous pollutants and irritants to the mucous membrane, and prevents damage to the water treatment system.