The efficiency of Ef- Chlor Bio- Tab / Effi- Sept/ Effi- Kleen 1.67gm & 4gm water purification and surface disinfectant tablets and granules containing sodium dichloroisocyanurate (NaDCC) as major components was tested against microbes collected in sterile vials from a poultry farm and identified using a microscope. The tests were carried out in accordance with US EPA guidelines, with physical parameters such as pH, odour, hardness, and so on of the water being tested, as well as chemical testing of the feed and litter to determine the toxicity present. In biological parameters, microbial cultures were prepared in broth and are serially diluted up to 10 dilutions, then microbes were cultured at 35-37°C using the pour plate method in sets of three, one is referred as control, and the CFU (Cell Forming Unit) of each plate was counted. To determine the kill time of tablets and granules, a log reduction procedure (up to 10 logs) was used by treating each plate except control with the desired tablet dilution. CFUs of each plate were counted again at various time intervals (5 minutes, 10 minutes, 15 minutes, and 20 minutes and so on respectively). Water, feed, and litter were also tested before and after EF- Chlor treatment.