Depending upon the cantilever size, this "siphoning" effect (technically known as capillarity) is a real physical phenomenon, relating to the surface tension of the fluid vs. the tube size. I do not know if this will cause a problem with these products attacking the cartridge, but small diameter tubes (capillaries) will definately draw a liquid up them (sorry, its too late to figure out a better way to write that sentence). You don't see it much in a straw due to its large diameter, but it can be significant for small diameter tubes.