-13-
W Carefully close the reagent bottle after each use in order to prevent the
liquid from oxidising.
W Do not exceed the expiration date shown on the WataTest bottle label.
W The WataTest reagent can also measure concentration of other chlorine
solutions (NaDCC, HTH, Bleaching powder, bleach), following procedures
at: www.antenna.ch
9. USING A SODIUM HYPOCHLORITE
SOLUTION TO CHLORINATE
DRINKING WATER
W It is important to chlorinate only water of sufficient quality, i.e. with a
turbidity of less than 5 units, and a pH between 6.5 and 8.5 (see section
4). If the water is muddy, cloudy or colored, it is crucial to filter or clarify
it beforehand.
The dose of active chlorine to add to the water so as to make it drinkable depends
on how contaminated the water is initially. To ensure that 99% of pathogenic
organisms are destroyed 30 minutes after chlorination, it is sufficient to check
whether any residual chlorine remains in the water. For this purpose, we propose
a pragmatic method that is ideal for visual checking using the WataBlue reagent
to determine whether a sufficient quantity of residual chlorine remains in the
water.
To guide you for the first dosage, we recommend a dose of 1.5 mg/L of sodium
hypochlorite. At this dose, 1 litre of sodium hypochlorite at a 6 g/L concentration
produced by the WATA device can be used to treat approximately 4,000 litres of
water, if the initial water quality is compliant with the above-mentioned turbidity
and pH criteria.
W Drinking water must contain between 0.5 et 1 mg/L of free residual
chlorine.
W The treated water must be stored in a clean, opaque, closed tank.
W Chlorination must be performed under the supervision of a qualified
person.
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