| Front | In the water treament process, about what percentage of the particles are removed at the settling tank? |
| Back | 90% |
| Tags | C9.4.5 |
| Front | Definition; metals of high atomic weight that are toxic to humans in relatively low concentrations |
| Back | heavy metals |
| Tags | C9.4.5 |
| Front | What test is used to find the level of contamination of total dissolved solids in the catchment area? |
| Back | filtration and gravimetric analysis |
| Tags | C9.4.5 |