I am not sure what you mean.... but if you are asking what is used on osmosis, it is only water molecules. Osmosis is the diffusion of water molecules from a high concentration are to a low...
Osmosis is the random movement of water molecules through a semi-permeable membrane from a region of high water potential to a region of low water potential.
Osmosis is the net movement of water from a region of higher concentration to a region of lower concentration through a cell membrane or other semi-permeable membrane, down a concentration gradient...