The concept of is primarily based on the purifying and recycling of shower water, plus the evaporation of Grey Water. Fractured Interstitial Water System uses the water from a shower and through a series of thought out cracks filtrates, purifies and re-disperses the water around the shower systems. The programme of recycling the water at the Burning Man Festival informs the architecture by controlling the cracking formation to the preferable form for the programme, the Grey Water cracks vary in depth and scale to suit the change in the needs of the water and allows the grey water to be taken out into the playa for evaporation.
Water is a desirable and limited resource at the Burning Man festival; this programme will reduce the need to remove numerous liters of grey water from the Burning Man site after the festival and allows the concept of showering to be a daily activity rather than once or twice in two weeks.
Evapotrons are devices used at Burning Man to evaporate grey water quickly and efficiently (and they look pretty damn cool!). A tray is filled with grey water and a drum runs over it which is covered by a dark absorbent material. This drum is constantly driven round by the wind. The absorbed water evaporates from the dark material at a much faster rate than if it were just sitting in the trough.
The website explains this process more thoroughly as well as providing information about the history and development of evapotrons over the years.