DISINFECTANT DRINKING WATER, HADEX 1LTR 550665

Work out the number of cans from the maker’s three dosages. At the normal dose of 1:50,000, one can treats 50 m³. At the extra dose of 1:25,000, for water of inferior or doubtful quality, it treats 25 m³. At the shock dose of 1:5,000 it treats only 5 m³. The shock dose is for suspected contamination and epidemic conditions, and for the first disinfection of tanks and pipelines after repairs or renewals. A 20 m³ tank needs four cans at the shock dose, so for shock treatment the larger cans are easier to handle.^[1]

Carry enough for the whole voyage. The WHO inspection handbook treats an insufficient quantity of stored disinfection chemicals as a deficiency. It says the ship should store enough to disinfect its water continuously for the whole voyage. Total the expected water volume first, then decide whether 1 litre cans are the right size or whether one 10 or 25 litre can would do.^[4]

Order the test kit at the same time. The same handbook says a ship should carry a kit that tests free and total chlorine (0–5 mg/l) and pH (6–10). It gives a free chlorine level of 0.5–1.0 mg/l during disinfection and at least 0.2 mg/l at the point of delivery. Hatenboer-Water also offers test kits that measure active Hadex in the water. Without a test, a hand-dosed tank is guesswork.^[4][1]

Do not mix this code up with the other sodium hypochlorite products in the same section, such as Purelox at 550671 and 550672. Those are separate products with their own instructions. The maker states that Hadex is approved as a continuous disinfectant in drinking water, with the dosages above. The shelf life is 18 months under normal conditions (25 °C) and 3 years when stored cool (6 °C or below). The SDS asks for storage in a cool, well-ventilated place away from heat.^[1][3]

The SDS classifies Hadex with the signal word "danger". It causes skin irritation (H315) and serious eye damage (H318), and is very toxic to aquatic life with long-lasting effects (H410). It lists strong acids, metals and reducing agents as materials to avoid, and gives nitrile gloves (EN ISO 374) and eye protection (EN 166) as PPE. Pour from a 1 litre can with goggles on.^[3]

For a system that needs superchlorination after contamination, repair or maintenance, the WHO handbook advises professional treatment at 50 mg/l over 24 hours, with the water unfit to drink in the meantime. For potable-water hoses, it advises filling them with a 100 mg/l chlorine solution for 1 hour, then draining and flushing before use.^[4]