| 摘要 |
Water treatment apparatus, such as a water softener, comprises two water treatment components (1, 2) and valve means for causing the two components to be rendered inoperable to treat water at respective different intervals so that at least one component (1, 2) is operable all the time, characterised in that the valve means comprises waterflow controlled valve means and the apparatus includes a water driven flow-meter (16) for controlling said valve means. <IMAGE> |
