1. ISO 7899/2. Water Quality—Enumeration of Faecal Enterococci by Membrane Filtration,1984
2. ISO 9308/1. Water Quality-Detection and Enumeration of Coliform Organisms, Thermotolerant Coliform Organisms and Presumptive E. coli,1990
3. ISO 10705-2. Water Quality. Detection and Enumeration of Bacteriophages—Part 2: Enumeration of Somatic Coliphages,2000
4. ISO 10705-4. Water Quality. Detection and Enumeration of Bacteriophages—Part 4: Enumeration of Bacteriophages Infecting Bacteroides Fragilis,2001
5. Anon, 2005. UK Environment Agency ‘Water for life and livelihoods’—key principles, Water Framework Directive.