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Distillation process (Example: Waterwise 4000)

  1. Ordinary tap water is heated to 212° F (100° C) killing microbes such as bacteria, cysts and viruses that may be present.
  2. Steam rises, leaving behind dead microbes, dissolved solids, salts, heavy metals and other substances.
  3. Some low-boiling light gases (VOCs) are discharged through the gaseous vent.
  4. Steam vapor is condensed.
  5. Purified/distilled water then percolates through an organic, coconut-shell carbon filter, enhancing quality by aeration, degasification and adsorption of VOCs (volatile organic compounds).
  6. The steam distilled water is then collected in the collector bottle (not shown), ready to enjoy.

Waterwise distillers remove VOCs

Volatile organic compounds that may be present in your tap water normally boil off and vaporize during the warm-up cycle and are vented into the air (see step 3 of distillation process). If any VOCs carry over with the distillate, they can be effectively removed with the carbon post filter (see step 5). Carbon enhances taste and purity by adsorption, aeration and degasification.

Most tap water contains either no VOCs or extremely low levels. VOCs are measured in parts per billion and are virtually undetectable when vented during the distillation cycle. Far more VOCs may be discharged into the air from running hot tap water or from a hot shower. if airborne volatiles are still a concern, use of a carbon prefilter will significantly reduce VOCs prior to distillation. The distiller could also be used in a remote location (i.e., utility room, garage, or a screened porch).

Exploded view of the distillation process (example Waterwise 4000)

All Waterwise distillers have coconut shell carbon, post filtration to effectively remove VOCs. Another option to consider would be a direct line hookup, fully automatic Waterwise 7000 distiller with an in-line carbon prefilter.

Carbon filtration before distillation is highly recommended if there are high concentrations of known (or suspected) VOCs where you will be operating your distiller.

In the news...

Methyl tert-butyl ether controversy

Methyl tert-butyl ether (MTBE) spreads more easily underground than other gasoline components due to its higher solubility in water. MTBE removal from groundwater and soil contamination in the U.S. is estimated to cost from $1 billion to $30 billion, including removing the compound from aquifers and municipal water supplies and replacing leaky underground oil tanks. There is some controversy centered around the question of who will pay the costs of this remediation. In one case, the cost to oil companies to clean up the MTBE in wells belonging to Santa Monica is estimated to exceed $200 million. In another case, the City of New York estimated a $250 million cost for cleanup of a single wellfield in Queens.

Recent state laws have been passed to ban MTBE in certain areas. California and New York, which together accounted for 40% of U.S. MTBE consumption, banned the chemical starting January 1, 2004, and as of September 2005, twenty-five states had signed legislation banning MTBE.

In 2000, the EPA drafted plans to phase out the use of MTBE nationwide over four years. As of fall 2006, hundreds of lawsuits are still pending regarding MTBE contamination of public and private drinking water supplies.

The EPA currently lists MTBE as a candidate for a maximum contaminant level (MCL) in drinking water. MCLs are determined by the EPA using toxicity data.

http://en.wikipedia.org/w/index.php?title
=Methyl_tert-butyl_ether_controversy