A multi-part sterilant system (12) which has a first part (4) with a first reagent in a carrier medium in a first container (6) and a second part (8) with a second reagent in a carrier medium in a second container (10). The first reagent and the second reagent will react to provide a sterilising composition when the first part (4) is mixed with the second part (8). The system has a pump head (2) with a peristaltic pump member (22). The first container (6) has a first-part dispensing tube (16) extending from its interior and disposed through the pump head (2). The second container (10) has a second-part dispensing tube (18) extending from its interior and disposed through the pump head (2). 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).
