Iron and manganese may be present in your spear or bore water

A metallic taste can be caused by manganese, iron, zinc, or copper.
These metals often discolour tap water and can stain plumbing fixtures and clothing. EPA has set non-enforceable secondary maximum contaminant levels for these contaminants that will prevent most aesthetic and cosmetic effects. EPA has set enforceable maximum contaminant levels for those contaminants that may cause adverse health effects. Some of the most lethal metals are listed below.

Heavy Metals-Lead (Pb);Cadmium (Cd);Mercury (Hg);Arsenic (As);Selenium (Se);Chromium (Cr)

The so-called heavy metals are toxic elemental metals such as Lead, Cadmium, Mercury, and Arsenic that find their way into water supplies from natural and industrial sources as well as home plumbing. These metals, especially Lead, can seriously affect the mental and neurological development of infants and children. Reverse Osmosis (R0) is recognized as the most practical method of reducing Lead to insignificant levels in drinking water. Carbon Block technology that incorporates ceramic ion exchange media is also an effective method of reducing lead.

Radium 226/228 (Ra)

Radium occurs in ground water due to the radioactive decay of Uranium in geologic formation. There is a health risk if the Radium level exceeds 20 pecocuries per liter (pCi/L). Cation exchange water softeners using proper regeneration procedures are effective in reducing Radium for POE applications. Reverse Osmosis systems are effective for reducing Radium for POU applications.