I like to do a cold cucumber & avocado soup in the Vitamix, real easy. I don't know how it is through the tube, but it can be thinned out with more broth.
1 or 2 cucumbers..chilled,peeled, seeded or use hothouse, no need to peel, seed.
1avacado...chilled, flesh removed
1 can chicken broth..chilled. I use low sodium or organic
1/4 cup sour cream..chilled
Salt, black pepper to taste
Little onion, garlic, cumin, paprika, optional
Just put I blender, blend.