Where are septic tank toilets used ?

Explanation

**Step-by-Step Solution:**

1. **Identify the Purpose of Septic Tank Toilets:**
- Septic tank toilets are designed to treat wastewater in areas where there is no connection to a centralized sewer system.

2. **Determine Locations for Use:**
- These toilets are commonly used in specific situations:
- **Hospitals:** In some cases, hospitals may not have access to a sewer system, making septic tanks necessary for waste management.
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