Explain the role of alum in the purification of water.

Explanation

### Step-by-Step Solution:

1. **Introduction to Alum**:
- Alum is a chemical compound, commonly used in water purification processes. It is known for its ability to clarify water by removing impurities.

2. **Understanding Water Impurities**:
- Water often contains various impurities, including suspended particles, dirt, and microorganisms. These impurities can make water unsafe for consumption.

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