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Biofilm CFU Log10 reduction after treatment with benzalkonium chloride in various concentrations without PP (at 1 atm) and with PP (at 3, 5, 7, and 10 atm) for 10 min (a) and 60 min (b). * p < 0.05, ** p < 0.01, *** p < 0.001, **** p < 0.0001.
