过滤 guòlǜ to filter
How to remember 过滤: 过 to cross + 滤 to filter = to filter.
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How it is used
- To filter - remove unwanted matter - 过滤杂质 (guòlǜ zázhì) to filter out impurities.
- Also very common figuratively/digitally: 过滤信息 filter information; 过滤广告/敏感词 filter ads/sensitive words.
- Note reading 滤 (lǜ). Covers physical filtering (water, air) and screening/sifting content - the sense of letting good through, blocking bad.