Bactericidal properties of studied membranes are illustrated in Tables 6 and 8 showing the CFU death rate % comparison between the commercial and UDD-embedded membranes. When microbially polluted water was filtered by the UDD-embedded PES membrane, the filtered water showed a death rate of 89% compared to the 88% shown by the commercially available PES membrane. At a 5% confidence interval, T-test analysis between the UDD-embedded PES and the commercial PES indicates no significant reduction on fecal E. coli CFU after the filtration was performed. Different from this, a significant difference in bacteria removal was seen, with a value of 0.02, between the functionalized UDD-embedded PES membrane and commercial PES indicating that the excess particle clusters above the membrane do not improve bactericidal properties and can lead to poor bacteria removal.