Coliform bacteria

References

1. Márcio Claudio Cardoso da Silva and Maurício Luiz Sens,
   Water purification by direct solar distillation process in isolated households, Acta Scientiarum. Technology (2014)
2. A Hanson and W Zachritz and K Stevens and L Mimbela and R Polka and L Cisneros,
   Distillate water quality of a single-basin solar still: laboratory and field studies, Solar Energy (2004)