Fluid Dose Dispensing Apparatus

Apparatus as claimed in claim 1, wherein the apparatus is adapted to dispense two or more doses of fluid in sequence and the vessel has at least a first chamber and a second chamber separated by the piston. cm 3. Apparatus as claimed in claim 2, wherein the first chamber is proximate a dispensing outlet end of the vessel and the second chamber is remote from the dispensing outlet and the first position of the piston corresponds to a position at which the first chamber of the vessel contains a first dose of fluid to be dispensed and the second position corresponds to substantially complete emptying of the first chamber of the vessel, whereupon the opening of the valve in the piston enables a second dose of fluid to be dispensed.

Apparatus for dosing a fluid/water flow system with one or more treatment chemicals, the apparatus comprising:

• a vessel;
• an inlet pipe or hose and an outlet pipe or hose for coupling to the system so that fluid/water from the system may flow into the vessel and fluid from the vessel may flow from within the vessel out of the vessel and into the system. the vessel having a piston therewithin and the vessel wail defining a cylinder in which the piston moves under pressure of incoming fluid from a first position at which the vessel contains fluid to be dispensed to a second position corresponding to substantially complete emptying of the vessel, wherein the apparatus has a bypass passage through or around the piston that opens when the piston substantially reaches the second position so that fluid/water from the system may flow passed the piston when the piston is at the second position to flush the vessel.