Having a toilet flush twice intermittently is not structurally harmful to your plumbing, but it is inefficient, inconvenient, and indicates an underlying mechanical issue. A double-flush symptom usually means the rubber flapper is closing prematurely because the flush chain is too tight, or the water volume in the tank is insufficient to clear waste in a single cycle. Adjusting the chain slack or fill valve float will restore normal single-flush performance. Verification: Test a single flush cycle to verify that all waste is cleared completely on the first pull.
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