Each ocean possesses a 'twin magnet'—characterized by a north-south/south-north polarity—which can be described as a 'Uranus-Venus' type of magnetic pairing.
Water exists in the form of two opposing charged streams (Uranus-Venus)—or two opposing liquid oceans and two opposing charged vaporous states (Venus-Uranus)—along with two opposing forms of ice (Uranus-Venus).
The 'Sand,' 'Desert,' or 'Neptune' twin planet is a 'skeletal' twin planet; this demonstrates that the other five skeletal twin planets—Mercury, Mars, Jupiter, Saturn, and Pluto—also lack water.