Is this technique sustainable?

Yes, recycled water plants are a great choice for Armenia. Armenia has lots of easily accessible water but they don't have great treatment plants as the government hasn't invested in the water. Recycled water plants are a very sustainable source. Recycled water plants are the ideal solution for Armenia, as they purify water easily and they are cheaper than other plants. Another reason they are ideal is the water content needed. Ground water Aquafiers and desalination plants don't usually use waste water, but recycled water plants do. This means if Armenia ever goes into drought or water famine, there are still options for water.