The Oasis 33mg Water Purification Tablets are designed to effectively treat and purify up to 5 litres of water per tablet. These chemical filtration tablets are ideal for outdoor activities such as camping and hiking, ensuring access to clean and safe drinking water. These tablets provide a convenient and reliable solution for water purification in remote or challenging environments. Ideal for camping, hiking, DofE expeditions, travel and emergency kits where you only need a small quantity. Supplied in foil strips, 10 tablets per strip. Expiry date 2031.