Yes, it is completely safe to pour old or expired hydrogen peroxide down any household drain. Hydrogen peroxide is non-toxic, environmentally friendly, and completely harmless to both PVC and metal plumbing pipes. In fact, pouring a bottle down your sink or shower drain can help oxidize mild organic slime, kill odor-causing bacteria, and freshen up sluggish pipes without risking chemical corrosion or damage to your plumbing seals. Verification: Pour the liquid directly into the drain and let it sit for 20 minutes before flushing with warm water.
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