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Sorry, pop-up cleaners are a pool thing. I've worked on a few rotating valves and such, but never a fitting. I have no clue. Maybe @JamesW or another pool guy is familiar with them.

I have only worked on a few pools with these, so am far from an expert, but it sounds like a flow issue. Are your skimmers and pump basket clean? What is the pressure at the filter? Have there been any changes made to the system? (Started running a slide or waterfall, turned down the pump rpm's...

Sounds to me like you could have a blockage in the cleaner itself. It should be on a regulator as mentioned, but should not need full-throttle to function. Add to that the collapsed hoses, and it all says "new cleaner" to me. At the very least, get a schematic and take it apart to check for...

I do not know TFP's feelings on acid wash. I can tell you it is dangerous, nasty work. And if not done properly, could leave your pool worse off than it is now. That being said, if you remove the top half-millimeter of plaster you remove any stains on it.

I was taught that clarifiers were made for sand filters to clump up and catch the small particulate that would normally blow through the sand, and that DE and cartridge filters already filter such small particulate that clarifiers are unnecessary. I was also taugh that a bit of DE in your sand...

I hope you were right and I misunderstood. That happens frequently, just ask my wife.

If I understand you correctly, you put a transformer in the battery compartment, buried it in silicone, and ran your 120v extension cord out under the edge of the battery cover, which you sealed with tape? I think it is sure to leak sooner or later. Make sure you always use a gfci plug for power.

Also, with the power off, try to turn the motor shaft by hand with pliers between the motor and plastic wet-end, or from the back of the motor under the cap with a screwdriver or allen wrench. The bearings might be sticking.