Like I said before, I’m open for a discussion about bat shit, so please relax. Of course, when they are water marks, then it is „undisputable proof”. I think it’s quite routine to use words like this in the world of research, but most of the time it’s just the start of a new discussion.

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Yes, randomly leaching up from the limestone floor. If that's even what we are seeing as when we go back to the original things become far less clear

and

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why does this picture show what is coming out of it as so white yet the marks that may or may not be on floor level barely discernible if at all

Your reactions are very good examples of people seeing different things. Exactly what I meant by saying that many researchers have overlooked the evidence. You are doing exactly the same.
Still, the white markings are really there.

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If this chamber was regularly flooded with water from the shaft would we not expect to see a distinct and regular water line let alone one that was the same color as what was coming out of the shaft?

It has the same color. Only with still standing water we would expect a regular water line. The marks show fast running water, a small waterfall coming out of the shaft and restless water.

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If all one needs is "white marks" G1 is replete with them having nothing to do with G1 as a machine using water. The exposed exterior blocks, for example, are covered in white streaks:

Yes and why do think that is? Thousands of years of moisture on the blocks.
And these white marks are not coming out of a shaft hole.

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I am curious though-if the water is supposedly leaking out of the shaft into the chamber then where did it come from?

Still trying to find out. There are so many mysteries. You believe the GP is a tomb, but no inscriptions, paintings, body, nothing. Same discussion.
Maybe there are more shafts. Maybe there was something built on the outside. I do not expect we are going to solve the mysteries of this building during our lifetime.

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You'll notice on the top of the right ledge a big chunk is missing that is also bone white. Hmmm. Did water do this you think yet leave the rest of the block black? Look at inside this socket in the GG

It's not the white color, I was talking about the V-shape of the stone.

And yes you are right on the dating of the Sphinx. I own a copy of the Traveler's Key to Ancient Egypt myself. But what I meant is that the theory became popular after the broadcast of the documentary.

Now, about the bat shit again. Here are some photos from the Bent pyramid, also a 4th dynasty pyramid and still full of bats:





A shaft opening/hole in the wall. No signs of bat shit here.



Again another hole. Again no bat shit. Lots of bats, but no bat shit.



Conclusion: The bat shit theory is very weak. Just like the tomb theory.