| Reverse-osmosis freshwater generators usually feature multiple membrane modules, typically of the spiral-wound membrane type. How are these multiple membrane modules piped? |
| A) The multiple membrane modules are always connected in parallel. |
| B) The multiple membranes may be connected in series, parallel, or in some combination of series and parallel. |
| C) The multiple membrane modules are always connected in series. |
| D) The multiple membranes may be connected in series or parallel, but never in some combination of series and parallel. |
