Each Hub also offers the possibility to buy clean and safe drinking water. Therefore, harvested rainwater and/or pumped ground-water is channeled though a special solar powered reverse osmosis, carbon filtered water treatment system that purifies the water. This treatment deactivates 99.99 % of E. coli bacteria and Legionella bacteria – the reasons for water-borne diseases like diarrhea. The purified water is stored in a drinking water-tank, where another UVC lamp prevents the growth of microorganisms, even at a longer storage period. The water purification system has a capacity of 5 liters per minute. Customers collect the water with their own containers in whatever quantities they desire.