original_query: What is the estimated cost of UV units to treat small batches or low flows of water at the community level?
query: What is the estimated cost of UV units to treat small batches or low flows of water at the community level?
answer: According to the World Health Organization, the estimated cost of UV units to treat small batches (1 to several liters) or low flows (1 to several liters per minute) of water at the community level is about US$20 per megaliter, including electricity, consumables, and the annualized capital cost of the unit.