Thanks to Ulf ...

Thanks to Ulf Mischke ,  Muhammad Alfalah Fauzi , John Turner ,  Cheryl Davis for their prompt response and interest in the matter. For all, a bit more information on my inquiry: The water source will be a highly contaminated (Hg) large enough river in a mining community (15,000 habitants), with deficient water supply. Water will be treated with state-of-the-art treatment plant (500 cubic meters per day, ultrafiltration and ozonation, assembled in a container, turnkey project) and delivery to the community with no cost or very little cost. Usage per person will be between 50 and 100 liters per day. Average family size is 4 persons. Existing water network is in poor condition as well as the water treatment plant from local water providers, and neither can be used. We want to avoid eventual complaints of illness in the community blaming water quality, and social unrest trying to have access to the water in a disorderly manner. So water should be delivered 2, 3 times per week to each family, in enough quantities to last between deliveries. Not easy solution; that is the reason for my inquiry.