Microbiological analysis of drinking water

  • E. coli
  • Coliforms
  • Faecal streptococci and Staphylococcus aureus
  • Sulphite-reducing anaerobes
  • Pseudomonas aeuroginosa
  • Total bacterial count
  • Aerobic microbial count
  • Yeast and mould
  • Salmonella and shigella
  • Vibrio cholerae and Vibrio parahaemolyticus

Chemical analysis of drinking water

Turbidity, color, total dissolved solids, pH, barium, copper, iron, manganese, zinc, silver, aluminum, selenium, calcium, magnesium, sodium, potassium, antimony, cadmium, arsenic, lead, mercury, chromium, nickel, molybdenum, boron, nitrate, nitrite, fluoride, chloride, sulphate, cyanide, residual chlorine, total hardness, alkalinity, phenolic compounds such as C6H5O5, polychlorinated biphenyls, polynuclear aromatic hydrocarbons, pesticides and mineral oil, anionic surface-active agents, etc.

Product performance evaluation of water purifiers — microbiological reduction
Product performance evaluation of water purifiers — chemical reduction

Product evaluation as per BIS, WQIA, NSF/ANSI standards

National standards

  • IS14724:1991 (RA2009) Ultraviolet-Based Water Purifiers — Specification
  • IS16240:2015 Reverse Osmosis-Based Point-of-Use Water Treatment systems — Specification
  • WQIA Protocol: IP 100 Guide Standard and Protocol for Microbiological Evaluation of Drinking Water Treatment Devices

International standards

  • NSF/ANSI 42 Drinking Water Treatment Units — Aesthetic Effects
  • NSF/ANSI 53 Drinking Water Treatment Units — Health Effects
  • NSF/ANSI 55 Ultraviolet Microbiological Water Treatment Systems
  • NSF/ANSI 58 Reverse Osmosis Drinking Water Treatment Systems
  • WQA S — 200 Voluntary Industry Standard for Residential & Commercial Water Filters
  • WQA S — 300 Voluntary Industry Standard for Point-Of-Use Low Pressure Reverse Osmosis Drinking Water Systems
  • NSF P231 Microbiological Water Purifiers
  • WHO Evaluating Household Water Treatment Options: Health-Based Targets and Microbiological Performance Specifications: 2011
  • US EPA Guide Standard and Protocol for Testing Microbiological Water Purifiers

Product evaluation includes

  • Chlorine reduction
  • Chloramine reduction
  • Turbidity reduction
  • TDS reduction
  • Lead reduction at pH 6.5 and 8.5
  • Arsenic III and V reduction tests at pH 6.5 and 8.5
  • Reduction tests of various other metals, namely mercury, chromium, cadmium, copper, selenium, etc.
  • Klebsiella, E. coli, MS2 phage reduction tests
  • Cyst reduction (microspheres) tests

Other testing facilities

  • Global migration of plastics
  • Metal leaching tests
  • Quality characteristics of detergents and sanitizers
  • Autopsy of RO membranes