| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | sewage system | Singapore | Advanced technologies for wastewater treatment and recycling | 1 |
| 2 | toilet cleaning | Singapore | The use of antibacterial and disinfectant cleaning agents is common in order to ensure a high level of cleanliness and hygiene in the toilet. | 1 |
| 3 | toilet cleanliness | Singapore | It is customary to flush toilet paper down the toilet to ensure cleanliness and hygiene. | 1 |