Effectively remove water, sediment, rust, red worm, micro-organisms and a variety of suspended particles.

有效去除水中的泥沙、铁锈、红虫、微生物和各种悬浮颗粒。

youdao

The red color is the result of iron oxide or rust.

VOA: special.2009.04.15

Known as the Gunflint Formation, its deposits are usually rust red from the oxides in them.

NEWYORKER: The Martian Chroniclers

The humpback chub, for example, thrived in the rust-red waters of the Colorado.

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Here, the deep burnt sienna red of the soil - rust-coloured because of its richness in iron - mingles with thickets of foliage and a sweep of clear sky.

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