Bithiah K. Y. Liu

Laboratory Manager

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A new testing service for ETL, our Microbiology division offers a wide range of microbiological analysis of environmental water samples as well as antimicrobial tests for consumable products, such as Heterotrophic plate count, Total coliforms, Faceal coliforms, E. coli, Legionella, and the presence of amoeba and pathogens.


Our experienced technical staff design testing protocols fit for each client's product specification, and offer diverse services such as swab test analysis, antimicrobial efficacy tests in textiles and plastics, and disinfection products and water filters, amongst others.


For further information or to receive a quote, please contact the Microbiology team

Water Testing
  • Legionella in cooling tower water and drinking water, including Legionella Pneumophila

  • Heterotrophic Plate Count (Total Bacterial Count)

  • Total Coliforms

  • E. coli in Drinking Water

  • E. coli in Marine Water

  • Faecal Coliform

  • Presence of Amoeba

  • Staphylococcus aureus in Water Samples

  • Pseudomonas aeruginosa in Water Samples

  • Vibrio cholera in Water Samples

Consumable Products Testing
  • Antimicrobial Effectiveness Test on Water Filter System

  • Antibacterial & Antifungal Activity on Textile Materials

  • Antibacterial Activity on Plastics Surfaces

  • Determining Resistance of Synthetic Polymeric Materials to Fungi

  • Determining Resistance of Plastics to Bacteria

  • Antibacterial & Antifungal Removal Test on Disinfection Products & Sanitizers

  • Swab Test on Surfaces to Determine the Level of Hygiene

Job Reference

Total Coliform and E. coli

Date: March 2016

Division: Microbiology

Project: The Sherwood - Quality Water Supply Scheme for Buildings – Fresh Water (Plus)

Client: Well Born Real Estate Management Ltd

E. coli

Date: December 2015

Division: Microbiology

Project: Shing Mun River Water Quality

Client: New Century Forum

Legionella Bacteria Count

Date: April 2016 to March 2017

Division: Microbiology

Project: Cooling Tower Water Quality

Client: Drainage Services Department - Shatin Sewage Treatment Works

Antimicrobial Effectiveness Test

Date: August to November 2015

Division: Microbiology

Project: Antimicrobial Effectiveness Test on Disinfection Products

Client: AQ bio Technology Group Ltd