I used to work maintenance at a hotel and they had a really great tool for cleaning debris like sand out of the bottom of hot tubs and could also be used for the times I needed to drain some water as well.
It consisted of a rigid tube maybe 1/2" thick and like 3' long with a marble on one side and a flexible hose on the other. The way it worked was you do like a repeated stabbing motion under water and the marble would allow water into the tube on the downstroke and prevent water from leaking out on the upstroke eventually the water would fill the tube and start flowing as if one siphoned water with a hose.
I can't for the life of me find the name or any info on google searches. Seeing if anyone know what I'm talking about here?
It's not the Spa Wand with the plunger type stick which keeps coming up on my searches.