The three biggest mistakes to avoid when using citric acid:

Incorrect concentration and dosage: Using a citric acid solution with too high a concentration (e.g., over 20%) or using it excessively can lead to issues such as metal corrosion, stone damage, and respiratory irritation. For example, cleaning an aluminum pot with a concentrated solution will corrode the oxide film on the bottom, resulting in grayish-white spots. The correct approach is to choose an appropriate concentration based on the material, such as 10%-15% for removing rust from stainless steel tableware, and only short-term wiping (concentration ≤5%) for aluminum products.

Incorrect contact time: Prolonged can cause excessive corrosion of metal parts or make plastic hoses brittle and crack; conversely, compensating for insufficient time by increasing the concentration may cause scratches or form a hard crust. For, when cleaning urine scale in a toilet, the solution should be left to sit for 10-15 minutes after spraying to allow the acid to fully decompose the calcium and salts in the urine scale before scrubbing with a soft brush.

Ignoring material compatibility: Wiping a marble countertop with a citric acid solution will cause the surface gloss to fade and pits appear. Additionally, corroding aluminum alloys may affect the performance of non-stick coatings. Different materials should be treated separately; for instance, stainless steel can be soaked with a medium (10%-15%), while aluminum products require cautious use.

The above incorrect uses of citric acid can lead to equipment damage, health risks, or environmental pollution. Therefore correct operating methods and safety precautions must be strictly followed during use.

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