How Soap Scum and Hard Water Minerals Clog Pipes
Clogged drains are rarely caused by a single culprit. More often, they’re the result of a chemical “team-up” between soap scum and hard water minerals—two common household factors that can combine into deposits strong enough to reduce flow and ultimately block plumbing.
Soap scum forms when the fats and oils in bar soap or certain detergents react with minerals like calcium and magnesium in hard water. Instead of dissolving and rinsing away, the residue clings to surfaces where water repeatedly passes—sink tails, shower walls, and the insides of drain lines.
Hard water minerals provide the structure
Hard water carries dissolved calcium and magnesium ions. As water evaporates or flows through warm plumbing, those minerals can precipitate—meaning they shift from dissolved particles to solid deposits. In drains, this process happens around existing grime, creating a ... Read more »
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