Determination of the efficacy of four biocides (Grotan, Bioban, Kathon, and Preventol) presented as logarithmic reduction in the cell concentration of M. immunogenum in mixed suspension. The biocides were tested at various concentrations for different contact times of 15, 30, 45, and 60 min. (A) Log10 reduction patterns of M. immunogenum in MWF fluid; (B) log10 reduction patterns in saline matrix.