Thallium

References

1. Bruce Dvorak and Sharon O Skipton,
   Drinking Water Treatment: Reversen Osmosis, NebGuide (2014)
2. Midwest Laboratories,
   An evaluation of the Pure Water Midi D Model ECP Distillation System, and the Pure Water A-12 Distillation System for removing select contaminants from drinking water, Scientific Report (1996)