How small? I just use a shop vac with a drain, and about 4 of the tubes (to make 1 long 6 footer) and the small crevice tool attachment. What I like is that the vac is multi purpose, can be used for other things. It worked great for my small 150 gal pond - now that I have 800 gallons it's not so great, kind of a pain having to start and stop to empty it all the time - but it does the job.

Very small...no idea on sizes. I may try a shop vac...thanks. The purpose built vacs are too expensive for my limited use. I can also use it to clean the house..:)

I use a pool vac hose and head, but siphon instead of hooking up to a pump. Works for raised ponds, or if you have a sharp drop-off. Not workable on flat ground.