We have a home that was built many years ago and as such it still has some glavanized pipe. I have replaced a lot with copper but not all. My bathrooms set pretty much one on top of the other and their drains share the same vent. I have no copper going upstairs yet. Water pressure is low and the water is dirty, I know why that is, the galvanized pipes are gunked up. But I am confused on this one. I notice it 99% of the time in the shower (downstairs), I hear a thump every now and then. No rhyme or reason to it. It almost sounds like an ejector pump or a sump pump shutting off. Now everything that requires risers appears to have them. Anyone have any idea what might be causing this noise?
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