Judas Iscariot wrote:The sinks are always being backed up, and the bathtub can take up to two days to fully drain out after a shower. This apartment is becoming a health issue more than a ghost one.
Hair and grease, probably. Dr Z has a solution. Go to a hardware store and buy 500g (~ 1lb) of caustic soda (NaOH). When the bathtub has drained out enough, pour about a quarter of it down the plughole. Then, pour some just-boiled water into it. Do this carefully - just a little at first, and
KEEP WELL BACK. Caustic soda heats up when dissolving, so the water will go back to boiling and can geyser up. Put the rest of the hot water in and you should be able to hear the heated caustic solution eat its way through whatever crud is in the waste pipe. When it is running clear, rinse everything thoroughly with warm water.
Outflow pipes do not make banging noises, only pressured feeds can. Are there other apartments in the building?