| 摘要 |
An investigation device for use in a potable water environment is described. The device includes pH varying means and investigation means. The pH varying means is capable of producing a pH of less than 7 in the surrounding aqueous environment and the pH varying means is sufficiently close to the investigation means to generate a pH environment of less than 7 in the vicinity of the investigation means. Typically, the investigation means incorporates a light transmitting surface. A method of investigating a potable water environment is also described. The lowering of the pH prevents bio-fouling, in particular, bio-fouling of the light transmitting surface. <IMAGE> |
