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Grease interceptors, drain smells and clogs that keep coming back
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For a service provider, I’d also note whether the problem seems limited to one sink or shows up at several fixtures, and whether those symptoms begin at the same time. That pattern is useful context for deciding what to investigate, but it isn’t a diagnosis on its own.
For example, if several fixtures start draining slowly around the same time shortly after an interceptor service, I’d give the provider both that timing and the service record, including what work was done. If only one sink is affected, I’d note that too. Those details can help focus the investigation; they don’t identify the cause by themselves.
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