Yes, chemical drain cleaners like Drano can be harmful to your plumbing system over time. The harsh active ingredients, such as sodium hydroxide (lye) or aluminum particles, generate extreme heat that can soften PVC glue joints, warp plastic P-traps, and corrode metal pipes or older brass fixtures if they sit too long without flushing. Furthermore, if Drano fails to clear a blockage and you have to use a mechanical snake later, standing caustic liquid can splash back dangerously. Verification: Rely on mechanical clearing tools rather than frequent chemical applications to protect your plumbing infrastructure.
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