Oasis Water Purification Tablets are manufactured by Hydrachem in the UK under strict quality guidelines. Hydrachem is an ISO 9001:2000 accredited company with an E.U. Medical Manufacturers Licence, GMP and also holds NSF certification for its Oasis range of Water Purification Tablets.

Hydrachem is also a large supplier to British retailers and has such holds the British Retail Consortium (BRC) accreditation. Recent changes to the BRC make it significantly more stringent and also incorporate the USA's Retail Industry Leaders Association (RILA) requirements.