General term for a device that filters liquids or gases. Can refer to kitchen strainers, laboratory filters, or industrial filtration equipment.
Before making coffee, I filtered the water with a strainer.
In this experiment, we use a special filter.
濾過器 is the native Japanese term for a filtering device, while フィルター is the more common loanword used for everyday and technical filters alike.
Standard kanji spelling using 濾 (filter).
Common simplified spelling with kana for the first character.
Irregular kanji usage; 瀘 is a variant of 濾.
Compound of 濾過 (roka, 'filtration') + 器 (ki, 'device'). 濾過 is from 濾 (ro, 'filter') + 過 (ka, 'pass through').