My pool drain is 9 feet underwater - and - I think it's clogged because the
pump runs dry every time I switch from both the spa & pool or just the spa,
to the pool only.

The drain cover has screws on top - but - it's 9 feet under (due to the
nature of the self-cleaning pool).

I long lost (20 years ago) my PADI scuba diving certification card (I
wonder if we can get a new one sent?) and I don't have tanks (although I
could buy them on Craigslist) and a regulator ...

So, I wonder, sans scuba equipment, how do you guy normally service your
deep drains to see what's clogging them up?