But the most interesting topic that has yet to be discussed on the use and reuse of greywater focuses on cultural issues"...
The culture of greywater is not a new topic to the Rainbow Water Coalition as the water footprint of prayer has been previously posted here.
UAE is no newcomer to developing innovative ideas to save water. Consider this article in The National describing the ambitious and expensive efforts to increase water security through aquifer storage and recovery of desalinated water stored in depleted aquifers.
The Rainbow Water Coalition initial interaction with the water visionaries of the UAE was at the Water Security workshop hosted by my colleagues and friends Drs. Mark Zeitoun and Naho Mirumachi where one of my classmates was an engineer from UAE. On the basis of my interaction with them at the workshop, coupled with the water news from the UAE over the past year, the water world could learn much from the Gulf states.