A small piece may not cause immediate damage, but it can potentially interfere with components depending on where it settles. Because the hack has no established benefit, leaving foil in the tank is not recommended.
What should I do if my toilet tank has rust-colored stains?
First, determine whether the discoloration is caused by iron in the water, corrosion, or mineral deposits. Use a compatible cleaner for the specific problem and seek plumbing advice if corrosion or recurring stains suggest an underlying issue.
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