貯水槽

1. Origins, structure, and basic meaning

• Structure: 貯水槽(ちょすいそう) means a water tank or structure that stores water for use.
• Basic usage: It is used for cleaning a building's water storage facility or checking it for leaks.

2. Common pitfalls and similar expressions

• The question being checked
  • 水が漏れていないか確認した means checked whether any water was leaking. か marks the content of the question being checked.