A multi-part sterilant system (12) comprising:a first part (4) comprising a first reagent in a carrier medium in a first container (6)；a second part (8)comprising a second reagent in a carrier medium in a second container (10)；wherein the first reagent and the second reagent will react to provide a sterilizing composition when the first part (4) is mixed with the second part (8)；a pump head (2) having a peristaltic pump member (22)；the first container (6) having a first-part dispensing tube (16) extending from its interior and disposed through the pump head (2)；the second container (10) having a second-part dispensing tube (18) extending from its interior and disposed through the pump head (2)；wherein the peristaltic pump member (22) when actuated acts on both the first-part dispensing tube (16) and the second-part dispensing tube (18) so as simultaneously to pump substantially equal volumes of the first part (4) and the second part (8).
