BICLOSOL tablets contain active ingredient NaDCC. NaDCC is the sodium salt of a chlorinated hydroxytriazine and is used as a source of free available chlorine (FAC), in the form of hypochlorous acid (HOCl), for the disinfection of water.
It is widely used as a stable source of chlorine for the disinfection of swimming pools and in the food industry, since it is more stable in sunlight than most other sources of chlorine.
It is also used as a means of disinfecting drinking-water, primarily in emergencies, when it provides an easy-to-use source of free chlorine.

BICLOSOL when added to water, NaDCC rapidly hydrolyses to release 1,5 g FREE AVAILABLE CHLORINE

Usage and technology:
   1. DISINFECTING A WELL after pollution

Wells must be disinfected :
- after construction (before they come into service)
- after repair or maintenance
- after a period of non-use (before being put back into service)
- after accidental pollution (after a landslide, if an animal falls in, or after floods, etc.).
Comment
Open wells must be maintained once a year (drained, the entire lining must be examined, repaired if necessary, any sediments accumulated on the bottom must be removed). The best time to carry out this maintenance is at the end of the dry season.
Technique
- Brush the walls above the water line with a solution of 200 ppm active chlorine obtained by diluting 10 times a solution at 2000 ppm
- Determine the volume of water contained in the well:
Volume of a cylinder : V = p x r2 x h
where V= Volume in cubic metres
p = 3.14
r = radius of the well = 1/2 the diameter in metres
h = height of the water in the well in metres
Example
A well of 140 cms in diameter and with a water height of 3.5 metres:
Volume = 3.14 x (0.7 x 0.7) x 3.5 = approx. 5 cubic metres.
- Determine the quantity of chlorinated product to be used to chlorinate all the water at a dilution of 100 mg of active chlorine per litre (100 ppm). For one cubic metre, BICLOSOL tablets with 1.5 g active chlorine, calculate the dose according to the percentage of chlorine.
Comment:
In countries were water is rare, chlorinate at only 50 mg per litre (50 ppm) to avoid having to throw away too much water at the end of the operation.
- Dilute the chlorinated product in buckets of water (without exceeding 250 g of product per 10 litre bucket).
Attention : do not use metal buckets because the metal reduces the chlorine (plastic, rubber or earthenware would be suitable).
- Empty the buckets into the well and mix the water with a large (clean) stone, at the end of a (clean) rope.
- Leave for 12 hours to take effect. Do not allow any access to the wells (this water is not suitable for consumption).
- Draw off the water and discard it until it no longer smells of chlorine, then continue using the well as normal.
Comment
If the well is equipped with a pump, proceed in the same manner but, after having poured the chlorinated product into the well and stirred the water, pump until the water which comes out smells of chlorine.
Leave it for 12 hours to take effect, then pump and discard the water until it has no further smell of chlorine.

  2. DISINFECTING A WATER RESERVOIR after pollution
Reservoirs must be disinfected whenever external pollution may have occurred. That is to say :
- after construction
- after repair or maintenance
- after a period of non-use (before being put back into service)
- after accidental pollution (after a landslide, if an animal falls in or if drainage water has entered, etc.).
Comment
Reservoirs must be regularly maintained (emptied, the sediments which have accumulated on the bottom removed, the wall brushed if possible and then disinfected).
Technique
Begin by draining the water, removing any sediments accumulated on the bottom and, if possible, brushing the wall
Then :
either
• brush walls with a solution of 200 ppm of active chlorine obtained by diluting 10 times a 2000 ppm solution and ensuring proper ventilation in the reservoir to avoid the inhalation of toxic chlorine vapours,
• allow to take effect for 30 minutes and rinse,
• fill and then continue using as normal.
Or
• fill the reservoir with chlorinated water at 50 ppm active chlorine
- for one cubic metre, you need 33 BICLOSOL tablets with 1.5 g active chlorine,
- add the chlorinated product dissolved in buckets of water at the start
• wait 12 hours,
• remove the water and continue using as normal.

  3. DISINFECTING/CHLORINATING DRINKING WATER
Disinfection of drinking-water is essential if we are to protect the public from outbreaks of waterborne infectious and parasitic diseases.