In urban Ahmedabad from August 5 – 13, 2014, three H2S tests and the IDEXX Quanti-tray were tested side-byside
on 426 water samples for a total of 1704 water quality tests. Water samples were collected from homes in pairs
of filtered and unfiltered tap water samples using standardized procedures into sterile 500mL bags and processed
within 8 hours. H2S tests were not diluted. Laboratory-made HsS utilized the Manja et al. [5] procedure, with a
modification proposed by Venkobachar et al. [6] to inoculate and sterilize homemade paper test strips with
laboratory-made bacterial media.