Name two inorganic impuritise present in sewage.

Explanation

**Step-by-Step Solution:**

1. **Understanding Sewage:**
- Sewage is defined as wastewater or waste material that comes from households, industries, and other sources. It contains various impurities, including both organic and inorganic substances.

2. **Identifying Inorganic Impurities:**
- Inorganic impurities are substances that do not contain carbon-hydrogen bonds and are often derived from industrial processes, manufacturing, and chemical synthesis.

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