| to all known species of life | 11 | transitive-object |
| for proper pool water management | 10 | purpose |
| in the form of chloride ions | 4 | other |
| chlorine → be → necessary | 25 |
| chlorine → be → required | 23 |
| chlorine → be → must | 3 |
| negative | neutral | positive |
| 0.308 | 0.571 | 0.121 |
| Raw frequency | 51 |
| Normalized frequency | 0.686 |
| Modifier score | 0.700 |
| Perplexity | 63.768 |