Abstract: The present invention provides a method for producing a gassed explosive composition, comprising the steps of: (a) providing a base explosive composition comprising at least an emulsion explosive composition containing a source of ammonium ions; and, (b) combining the base explosive composition with a gassing solution subsequent to the formation of the emulsion explosive composition, the gassing solution comprising a pH lowering agent. A gassed emulsion explosive composition is also disclosed.

Abstract: A water treatment apparatus is operated by providing water to be treated in a reactor; passing air through a gas flow path which includes an ozone generator wherein the passage of the air through the ozone generator produces ozone enriched air, and subsequently introducing the ozone enriched air into the reactor from the gas flow passage; providing an electric current source for powering the ozone generator; providing an member to emit a signal (preferably a visible signal) representative of the level of current drawn by the ozone generator; and, using a sensor to monitor the signal produced by the member.

Abstract: A vacuum cleaner handle is provided which offers improved ergonomic characteristics by providing a grip portion which is offset from the center line axis of the cleaner head.

Abstract: A waste water filter system has a collector body (14), a disposable filter (20) positioned within the collector body which retains particulate matter and grease while not retaining waste water, and an access aperture (28) in the collector body for removing and replacing the filter.

Abstract: A height adjustment mechanism for a vacuum cleaner includes forwardly positioned lift off wheels which move downwardly when the handle of the vacuum cleaner is moved to the raised position. Two transfer members convert the rotational movement of the handle to vertical motion of the lift off wheels.