If it's grease build-up, you might try periodically pouring a gallon or
two of boiling water down the kitchen sink.
You might consider buying one of those cheap USB endoscopes from Amazon
or Ebay. I bought one for about $15 on Prime Day a couple years ago.Â
The camera quality is pretty bad but they're pretty long...mine is about
15 feet. You could snake it down your kitchen drain clean-out and see
for yourself what's going on inside your pipes.
On 12/7/20 08:25, Jim Franklin wrote:
> Maybe some of you have an innovative solution...
>
> My house has a single cast iron soil stack that does both drain and vent.
> When I flush the toilet, it sucks air from the tub drain. The toilet and tub
> enter the stack separately, but at the same height, using an oddly specific T
> with a 4" toilet and a 2" tub inlet about 45 degrees apart. The tub does not
> have its own vent. 2 years ago I had a plumber snake the vent from the roof,
> he found "stuff", and it was fixed. Last week it started again.
>
> My kitchen sink T's into the stack at knee height, so it's the highest item
> on the stack. My thought is, because it's a straight T, not a sanitary T,
> stuff from the sink is solidifying inside the T when the flow hits the back
> of the T, and eventually forming a cap of "stuff" just above the T entry,
> sealing off any venting. I can't tell if the sink is also being used as the
> toilet's vent because there are too many walls in the way to hear what's
> happening.
>
> My other thought is that the "stuff" is growing like a mold, and sealing it
> off. Does stuff grow in drains?
>
> Any thoughts on what it might be, and how to prevent it? I rarely put oils
> down the drain, and when I do they are cold and mixed with Dawn to emulsify
> it. There isn't enough canopy for leaves or squirrels to get in the roof vent.
>
> thanks,
> jim
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