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I dropped some string down the pipe with a weight attached, which hit water around where the bend appears. (I did not add any water to the drain, so this is standing water that has been there since removing the tub many moons ago). I know the smart thing to do would be to remove the black...

The black plastic looks to be leftover from whenever the foundation was poured for the house. I can see something that starts to look like a bend, possibly a p trap, but whatever connection there is to the other pipe is hidden by the plastic bucket.

Thanks for the reply. If there has never been a problem with sewer odors, is it safe to assume that there is a p-trap somewhere below the waste tee, and it's just not visible?

I'm doing a remodel with a tub on concrete slab foundation, and I needed to replace a portion of the pipe. The original assembly did not have a p-trap, and is like the one pictured, which is the setup usually sold at box stores. Are p-traps supposed to be added to these assemblies?

As a followup, what if you were to waterproof the concrete using a penetrating wood and concrete sealer (which is also applied to the wood studs), would you still need a liner?