What you may want to consider if freezing is your concer is pour a little of that to antifreeze in and run it thru the pump. Just a thought

If it really bothers you that much you can put an auxiliary pump with a screened pickup. My boat came with one and the hose rests in the lowest part of the bilge behind the regular bilge pumps and pulls out any remaining water that the bilge pumps miss. Its a Jabsco "water puppy".. Model # 18660-0121

Forgot about that one. It does an ok job unfortunately what happens is the pump starts to capitate and all of the water in the hose drains back into the bilge. There is no getting around having some water in there.

Shop Vac has worked best for me, and it doesn't care about cavitation. I have a 12V Stanley that I picked up through Amazon, only holds one gallon, but gets the job done.

That's funny, it only took 5 posts to go there.

Drill a hole in the bottom?

I should try that hahah

but then the salt water rusts your shop vac !

Been many a time I was going to do that to my boat and let that f'er sink in Erie. Stupid boat.

You mean disintegrates!!!