Just an old 2-basin kitchen sink. We ripped the old copper drainpipe out maybe 4 years ago, installed ~ 5' of pvc.
Drain runs slow. Works, but obviously only 2/3 of capacity. I start with bakg soda and vinegar, then some crystal Drano, then the pot of boiling water, then the plunger. No noticable effect.
Any ideas?
TIA, P
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