The waste product can be constituted of sewage, leachate, surface water or industrial sewage water.

• Nutrition resource aspect
  The nutrients (N P K) in the waste product completely or partially replaces the need for commercial fertilizers and replaces finite phosphor for instance.
  
• Water resource aspect
  Floating and organic (waterbinding) waste products completely or partially replaces the need for irrigatoin. The use of wastewaster, surface waters or leachate preserves or frees up other valuable water resources for other needs in the society.
  
• Purification and environmental aspect
  Willow cultivation completely or partially replaces the need of other treatment of the waste product. The soil plant system serves as a natural physiological-chemical-biological reactor with ground particles, ground organisms and willow as active parts in the purification task
  
• Economy aspect
  The cost of fertilization and irrigation in "converntional" energy forest represents 20-30% of the total production cost. Purifying of sewage and leachate water can be done, depeding on the local conditions, with higher cost efficiency in willow cultivation compared to conventional technology.

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