To test for sewer gas leaks in your home, you can perform a professional smoke test or a peppermint test. For the peppermint test, pour a few ounces of concentrated peppermint oil down the roof vent stack on your roof, and have someone walk through the house sniffing plumbing fixtures; the strong scent will pinpoint any unsealed trap, cracked pipe, or failed toilet wax ring. Alternatively, professional plumbers use electronic gas detectors to measure atmospheric methane and hydrogen sulfide levels safely. Verification: Inspect suspect fittings immediately wherever the peppermint scent or gas detector indicates a breach.
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