In Australia, there are a range of filters available to reduce harms from injection of illegal drugs and pharmaceutical tablets. Many people use cigarette filters that are typically able to filter particles larger than 50μm (3). Commercial filters are also available. Apothicom produces: sterile cotton pellets (in the Stericup) that provides good filtering of particles larger than 10μm (4); the screw-on tip sterifilt basic with a 10μm membrane; and sterifilt+ with an 0.22μm membrane. There are other brands of wheel filters that have membranes of 0.22 and 0.45μm. These very fine membranes are able to remove most bacteria from contaminated samples (5).