A chamber having an inlet for receiving polluted storm-water runoff and an outlet for the storm water to flow out. The display controller is provided with a V-I conversion circuit for image data and a mode register, and the source driver is provided with an I-V conversion circuit for image data. The pedestal driving voltage and the brightness control voltage can be reciprocally controlled without modifications to a circuit having limited amplification, and the brightness can be improved without saturating an image in a highlight mode. The bridge has a memory for holding data received from the second device and is operable to translate from the second to the first protocol. A machining fluid for one of an electrical discharge machining process and an electrical discharge machining-polishing process, comprising a polymolecular powder, a hard particle and a carrier liquid, wherein a concentration of the polymolecular powder is lower than 500 gL.