Abstract: A waste material collecting bin has a storage container (24) for containing waste material fed into it via a rotary inlet valve (22). Prior to dropping into the container waste material rests on the valve adjacent the inlet and is there sprayed with treating substance drawn from a reservoir (19).

Abstract: A bolus for administering a biologically active material for example an insecticide into a liquid environment such as the water of a reservoir or lake or an anthelmintic into the rumen juices of an animal comprises a succession of liquid impermeable outer segments (153, 263) enclosing a core which in the simplest case may be a single unitary active material segment (151, FIG. 14) or in a developed embodiment may comprise a succession of annular segments (269, FIG. 25) contained in sealed recesses (267) in the outer segments (263) which are located on a degradable central rod (265) e.g. of magnesium alloy, which itself will be active for instance to combat magnesium deficiency.As shown in FIG. 25, the device may incorporate a weight (275) which, in animal use, inhibits regurgitation.