Patent ID: 9576829
Date: 2017-02-21
CPC Classifications: B01D,H01L

Claim:
1. A method of operating a process liquid supply apparatus, the process liquid supply apparatus including a filter unit, a discharge outlet for a gas in a process liquid, and a liquid sending unit which are provided in a flow passage located between a process liquid supply source and a nozzle in that order from an upstream side, the process liquid supply apparatus supplying the process liquid to target objects through the nozzle by the liquid sending unit, the method comprising: filling the filter unit with the process liquid from an upstream side of the filter unit to a downstream side of the filter unit after newly mounting or replacing the filter unit; and repeating a depressurization filtering process and a pressurization filtering process for a predetermined number of times, the depressurization filtering process depressurizing the process liquid in the downstream side of the filter unit and thereby allowing the process liquid to permeate through the filter unit, the pressurization filtering process pressurizing the process liquid from the upstream side of the filter unit and thereby allowing the process liquid to permeate through the filter unit.