TEST CONCENTRATION NaOCL, HTH, NaDCC, bleach (WataTest) 50ml

Test to determine the concentration of active chlorine in solutions (Cl , HOCl, OCl-) in grams per litre, ranging between 1 to 7 g/l (0.1 to 0.7% active chlorine and 0.32 to 2.23 °Cl). Measurement accuracy is ± 0.5 g/l.

The WataTest® reagent can measure concentration of chlorine solutions made from different solutions such as NaDCC, HTH, bleaching powder and bleach.

The WataTest® test set contains:

• a 50 ml bottle of WataTest™ reagent
• a 20 ml measuring spoon
• a 3 ml pipette
• a 1 ml syringe
• an user manual

The ideal result should be around 6 g/l, maximum 7g/l. If you obtain a different concentration, make sure you adjust the dilution of the solution.

Always use a clean, dry syringe to collect the WataTest® reagent!

Steps for testing:

• thoroughly mix the concentrated solution to be tested
• using the plastic pipette, collect exactly 2 ml of the concentrated solution, and place that amount in a dosing spoon, or the small container with a white base
• shake the bottle of the WataTest® reagent
• fill the syringe with the WataTest® reagent and be ready to count the number of drops that will be used
• holding the syringe vertically, let the WataTest® reagent fall one drop at a time into the dosing spoon or the small container with a white base and count the number of drops added while gently shaking until the solution changes colour permanently
• divide the number of drops by 2 to obtain the concentration in grams per litre (e.g. : 12 drops = 6 g/l)
• shake gently after adding each drop; if the solution in the dosing spoon or small container turns light-coloured again, add one more drop, repeating until the colour change no longer reverses

For information on chlorination and chlorine generating products, see "Public Health Engineering in Precarious Situations", MSF, 2nd edition, 2010:

• T.B. 2.19 Chlorine-generating products
• T.B. 2.21 Batch chlorination of drinking water
• T.B. 2.22 Monitoring chlorination