Minimize inventory with bioindicator discs made of special filter paper inoculated with dual spore species that can be used to check the effectiveness of steam, ethylene oxide (EO), and dry heat sterilizers. STERIS Spordi Biological Indicator Discs can be placed inside your devices to create a customized challenge device. After the sterilization cycle is complete, discs should be transferred aseptically to media and incubated.