Potential cause / solution to mildew in kitchen drain
Like many people, I have a problem with a persistent mildew smell from the drains of my kitchen sink. It's not necessarily the disposal as the smell is strong from both sides.
In the last house we lived in we had the same issue, although that house did not have a disposal. I actually changed the pipes in the previous house to try to resolve it. This proved there was mildew in the pipes. Short lived relief. Both houses have one thing in common: the "T" that connects the drain from the sink and the drain from the disposal to the P trap has a small 'flap' that appears to be intended to direct the water from the disposal down to the P trap. This would logically prevent the disposal from causing waste to come flying up the other side of the sink, which is how it always seemed to work when I was a kid.
I suspect that this 'flap' prevents enough airflow that would otherwise allow the drain to breathe and not become a breeding ground for mold.
I never recall my parents having this kind of trouble, which was in homes with both PVC and brass plumbing. Should I find a replacement "T" that doesn't have this 'flap' thing to direct the flow? Would that theoretically allow the drain to breathe enough or am I just reaching for straws?