Abstract: In a waterjet cutting system utilizing abrasives added to the cutting liquid, a liquid purifier is provided to remove the abrasives from the liquid before the liquid is disposed of including a disposable reservoir with a removable end plate sealingly engaged with the end of the reservoir. A baffle plate is rigidly connected to the end plate such that when the end plate is in position, the baffle plate will divide the interior of the reservoir into two compartments. An inlet nozzle is attached to the end plate to feed the liquid into one of the compartments on one side of the baffle plate, and an outlet nozzle is attached to the end plate on the other side of the baffle plate, such that the liquid must change directions when it travels from the inlet to the outlet nozzle to assist in the separation process.