The APU2 is used mainly for empty aerosols (up to 750ml), where there is only a small amount of product present. The unit deals with one can at a time and the propellant is passed through activated carbon filters.

The company’s Drum-based unit can be used for part- or completely-full aerosols, releasing both propellant and product into a 205 litre metal high head drum. The propellant is filtered and the liquid remains in the drum for onward recycling.

The new Trio Unit will treat three aerosols at a time and operates in the same way as the drum-based unit.