Have same pump.

How about Gorilla tape all around the bottom and a few slits at the
very bottom. That seals the intake down to the last quarter of an inch
or so.
But to run this, you have to have enough water in the pool to prime the
pump, 3 inches.

Otherwise use a water driven syphon to suck the last water out of the
pool. Uses some water for the syphon to suck and push. Run the output
into a barrel if the pool is too deep for the syphon to lift it out
(water supply pressure and syphon design).
I made my own out of PCV pipe and a few brass fittings. With all
properly sealed it works well.

Harbor Freight also has a clean water pump that will take the level way
down. If your green water is just green, that will work and that pump
is cheap. I use make-shift filter for the clean water filter to get
large items out. That clean water pump will handle some nuggets. See
the specs.

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