TWINSTAR ReactorReplacement Twinstar Reactors. The original Twinstar electrode reactor is created with beautiful design, delicate surface treatment, and details beyond perfection. Each spare part can fit several of Twinstar's state of the art sterilizers. It is recommended to replace the reactors once a year to maintain optimum performance, be sure to select the appropriate variation for your model. M5: M5 M3 S5 S3 Shrimp50 Shrimp30 M7: Nano Yotta Shrimp M9: Nano