Specifications: The "PETROTO VILLAS" tourist unit in south Rhodes with its 5 Villas operates during the tourist season from April through October. The owner is interested in having a wastewater treatment plant operating ecologically resulting in cost-savings which are:

- No external energy input
- No chemicals
- No machinery
- No maintenance
- No sludge production or removal

Further more the Root Zone System is reliable in its operational efficiency and stability despite the seasonal operation with fluctuations in the hydraulic load. Every April, when the unit restarts the saison, the Root Zone plant begins to operate without any need of maintenance unlike technical systems, which need at least two weeks maintenance to get started.

The Root Zone system fits harmoniously amids the natural landscape of pine trees after sedimentation of the solid matters in a septic tank. The system's cleaning efficiency is 100 %. There is no effluent because of the evapo-transpiration in the summer period. Thus the system causes no environmental loading.

Technical Characteristics:
Unit's capacity: 20 P.E.
Size of the ROOT ZONE plant: 100m2
Year of construction: 2008