<Tr> <Td> M </Td> <Td> = Make - up water in m / h </Td> </Tr> <Tr> <Td> </Td> <Td> = Circulating water in m / h </Td> </Tr> <Tr> <Td> </Td> <Td> = Draw - off water in m / h </Td> </Tr> <Tr> <Td> </Td> <Td> = Evaporated water in m / h </Td> </Tr>

The most common source of water in a distillation tower is from