pH

References

1. Rada Zarasvand Asadi and Fatihah Suja and Mohd Hafidz Ruslan and Nurul'ain Abd Jalil,
   The application of a solar still in domestic and industrial wastewater treatment, Solar Energy (2013)
2. Márcio Claudio Cardoso da Silva and Maurício Luiz Sens,
   Water purification by direct solar distillation process in isolated households, Acta Scientiarum. Technology (2014)