Answer: Water is an excellent solvent meaning solutes will freely diffuse and be dispersed in a solution of water very quickly.
Explanation: Water has many properties that allow it to break up and dissolve many materials in addition to its natural ability to spread out and disperse a lot of solutes meaning that water might not literally chase milliosmoles, but it will move them around very quickly and efficiently.
Large gas giants that vary being VERY cold or VERY hot 2 have rings noticable but saturns are the most significant