NOVELTY - A waste material treatment apparatus (100) for cultivating bacteria, comprises: a conduit (101) having an upstream and a downstream section. The downstream section of the conduit comprising first Venturi eductor (111) with at least two inlet ports (117, 118), where one of the inlet ports is in fluid communication with a supply of nutrient and another one is in fluid communication with a supply of bacteria such that, in use, nutrient and bacteria are drawn into the Venturi eductor by a fluid passing along the conduit and Venturi eductor.    USE - For cultivating bacteria (claimed); particularly for removal of grease from the grease traps and plumbing of commercial kitchens such as those used in e.g. hotels, nursing homes, restaurants.    ADVANTAGE - The bacteria cultivation apparatus by using the Venturi eductor to supply nutrient and bacteria greatly simplifies its design particularly by minimizing the number of powered and moving parts required, and also reduces the number of conduits required to just one. Thus the apparatus has reduced production and maintenance costs when compared with the prior art. The action of fluid flowing along the conduit draws in nutrient and bacteria avoids the need for any additional pumps. This, again, minimizes production, maintenance and running costs and removes points of failure from the apparatus to make it more reliable.    DETAILED DESCRIPTION - A waste material treatment apparatus (100) for cultivating bacteria, comprises: a conduit (101) having an upstream and a downstream section. The downstream section of the conduit comprising first Venturi eductor (111) with at least two inlet ports (117, 118), where one of the inlet ports is in fluid communication with a supply of nutrient and another one is in fluid communication with a supply of bacteria such that, in use, nutrient and bacteria are drawn into the Venturi eductor by a fluid passing along the conduit and Venturi eductor. The apparatus further comprises a first valve associated with the conduit, and controlling a supply of fluid along the conduit, where the first valve is a first timer operated valve operated by an electrically operated solenoid valve; second Venturi eductor in fluid communication with the first Venturi eductor, and having at least one inlet port, where the inlet port of the second Venturi eductor is in fluid communication with a supply of air such that, in use, air is drawn into the second Venturi eductor by a fluid passing through it and the air supplied to the system is drawn from the atmosphere; a casing formed by rotomolding which houses the Venturi eductor; a mixing chamber (103); and a second timer operated valve which is programmable to operate automatically at pre-set intervals. The electrically operated solenoid valve is battery powered. The mixing chamber further includes an aerator in the form of a bubbler; and heating device. The conduit is a siphon. The first Venturi eductor draws dormant bacteria suspended in a liquid; and draws nutrient in liquid form. INDEPENDENT CLAIMS are included for the following:    (1) introducing (m1) nutrient and bacteria into the conduit for mixing in it, involving: passing a fluid along the conduit such that a pressure drop in the first Venturi eductor draws nutrient and bacteria into the eductor to mix in it; and allowing the bacteria in the mixture to cultivate for a predetermined period of time; and    (2) cultivating bacteria, involving carrying out the method (m1), repeating the passing and cultivating steps until a desired amount of bacteria is cultivated, and dispensing the fluid to a use location.    DESCRIPTION OF DRAWING(S) - The figure shows a front view of an apparatus with a cover of a casing removed, showing articles contained in it.    Apparatus (100)    Conduit (101)    Battery-powered timer (102)    Mixing chamber (103)    Rotomolded casing (104)    First Venturi eductor (111)    Two inlet ports (117, 118)