Aquapura Tanksafe Water Purification Tablets for Overhead & Underground Tanks. 50 Tablets Pack. Each Tablet for 500 Litres Water. 3 Years Shelf Life & Warranty. Stable in Water for 48 Hours. Active ingredient is used in 67 countries for water purification, approved by WHO as “fit for prolonged human consumption” since 2003 and recommended by WHO, Red Cross of Indian Standards. Makes Water Sterile, Safe, Germfree & Pure quickly for Drinking and Hygiene Applications. Ensures safety & prevents all communicable water borne diseases & illnesses like Typhoid, Dysentery, Diarrhea, Cholera, Jaundice, Gastroenteritis etc. Leaves no unpleasant taste, smell/odour in water. Its residual provides ongoing protection to water from recontamination that cannot be provided by boiling, filtration, RO Systems, gadgets & equipments. Must be used in water that has been boiled or purified using filter, gadgets, RO Systems & equipments to provide ongoing protection against recontamination. Does not require boiling of water or use of filters, gadgets, RO Systems, gadgets & equipments. Saves energy, fuel and is environmental friendly. No maintenance, replacement hassle & expense. Does not need running water, candle, electricity, filtration membrane or ultraviolet light like other water purification systems. Just drop one tablet in water and use or consume the water as desired. Extremely cost effective, small, light weight, compact & easy to use. Safe to handle and store. No measuring required because it is in tablet format. No spillages or leaks. Manufactured using Food & Pharma grade ingredients. No Negative Health effects. Prevention is easier than seeking medical treatment once infected. Sanitation, Cleaning and Hygiene cannot be obtained without Safe Water. Removes bad smell in homes, workplace, kitchens, food preparation areas, washrooms, bedrooms, public areas because it kills the bacteria that produce the smells.