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Why is stainless steel sometimes used in freshwater aquarium systems?
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aquarium
A freshwater aquarium.
Stainless steel is sometimes used in freshwater aquarium systems primarily due to its remarkable resistance to corrosion.1
This resistance is imparted by the inclusion of chromium—typically 10 to 30 percent—which, when combined with low carbon content, protects the metal from degradation when exposed to water. Because freshwater environments are generally less chemically aggressive than saltwater or industrial settings, high-quality stainless steel alloys can provide a durable, long-lasting material for equipment such as heaters, filter components, or structural supports without leaching harmful substances into the water.1