Plumbers generally advise against putting large quantities of used coffee grounds down a kitchen garbage disposal, despite common misconceptions that they are harmless. While a small amount rinsed occasionally with plenty of cold water will not instantly ruin your pipes, accumulating coffee grounds tend to pack tightly together, bonding with grease and food sludge to form a dense, cement-like paste. This stubborn sediment settles inside P-traps and branch lines, eventually causing severe clogs and slow-draining sinks over time.
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