Apparatus for Treatment of Liquid A flow-through assembly for electrocoagulation treatment of a liquid has a replaceable cartridge with sacrificial electrodes held in a chamber arranged for flow of the liquid through and over the sacrificial electrodes. The chamber has a pivoting door which can be opened for removal and replacement or refurbishing of the cartridge. One electrode for providing a current to electrochemically dissolve the sacrificial electrodes is located in the chamber with a second electrode on the inner face of the door, with the sacrificial electrodes located between the current-providing electrodes with chamber door closed in use.