除去

1. Origins, structure, and basic meaning

• Structure: 除去 (じょきょ) is an action noun for removing unwanted or harmful material from something.
• Basic usage: ほこりを除去した describes removing accumulated dust from a filter, while 不純物を除去する装置 modifies equipment that takes impurities out of water.

2. Common pitfalls and similar expressions

• Removed material and retained medium
  • In ほこりを除去する and 不純物を除去する, を marks the material taken away. The verb does not mean discarding the filter or all the water.