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Hey I would like to help you with your water softener. Do you notice the issue just at random times? I know water softeners have what they call backwash (upflow)mode. When untreated water is washed out to a drain. That could be what your hearing.
Hey how's it going? Is your softener still making that noise? The drain pipe from your softener could drain into the same pipe your washer drains into. Which could sound like your washers draining. But it's actually your water softener doing its cleaning!