DISINFECTANT DRINKING WATER, HADEX 10LTR 550667

Size the order from the maker’s three standard dosages. At the normal dosage, 1 litre per 50,000 litres of clear water, one 10 litre can treats 500,000 litres, or 500 m³. At the extra dosage for water of inferior or doubtful quality, 1:25,000, it treats 250 m³. At the shock dosage, 1:5,000, it treats only 50 m³. The shock dose is for suspected contamination, epidemic conditions and the first disinfection of tanks and pipelines after repairs or renewals.^[1]

Plan stock for both routine and shock use. After a tank repair, a 100 m³ tank and its pipelines need 20 litres at the shock dose, which is two cans. At the normal dose the same 100 m³ needs only 2 litres, so a 1 litre or 2.5 litre can may be easier to dose by hand on a small ship.^[1]

The maker gives a shelf life of 18 months under normal conditions (25 °C) and three years if stored cool, at 6 °C or below. Do not order more than the ship will use in that time. Water dosed at the normal rate is ready to drink after about 30 minutes.^[1]

The maker lists approvals including the Dutch Ministry of Health (Ctgb registration No. 9574N), the UK Health and Safety Executive, the Norwegian Institute of Public Health (NIPH), Germany’s BfR (N-69753), Austria’s BMLFUW and Belgium’s FOD (15917B). It also names DSI, DOT and NMD among the maritime authorities that approve it. If the flag or the company asks for a particular approval, state it on the order.^[1]

Some flags require tested drinking water. Portugal’s Circular No 74 is one example. Tanked drinking water must be tested at least once a year at the final dispensing point. If the crew test it themselves with a kit, they must test every six months. If a result fails, the tanks and delivery pipes are drained, cleaned and sterilised before they are refilled.^[2]