I have recently noticed that in recent days I am hearing a gurgling sound in my bathtub drain when I flush the toilet and also run the water in the sink. I haven't detected any slow draining or backing up. This is an old house with three bathrooms on three levels. The gurgling is the bath in the middle level. There is a 4" soil stack from the toilet through the roof in the wall of this room. The drain from the tub and lav. goes into a 4" iron soil line heading to the septic tank. My washing machine drains at this mid-level as well, and I have had no back up or overflow, but I don't think the noisy drain is normal. I hate to wait till I have something overflow before I do anything, but I am uncertain what I should do. Any suggestions?
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