microdyn2From the Tavistock Group’s website:

The leading water purification company in Mexico, Microdyn is an all-natural liquid treatment used as a cleansing agent for water, produce and utensils in homes, restaurants, office buildings and hospitals. Microdyn eliminates harmful organisms without altering the taste, smell or color of treated food and water.

The all-natural ingredients of Microdyn include colloidal silver – a liquid suspension of silver particles – which is tasteless and non-toxic, although if taken in sufficient quantity it might change your skin’s color. Silver has been shown to kill bacteria in vitro as well as in vivo and is used in a number of medical situations, including bandages and catheters where bacterial infection needs to be prevented, minimized or eliminated.

Colloidial silver was in use until the 1940s when anti-biotics became more widely available. Then, during the 1990s, it was promoted as an alternative medicine. The World Health Organization recommends colloidial silver (produced by electrolysis of silver electrodes in water) and colloidal silver in water filters as two methods of purifying water in third-world countries.

One of the Mexico ex-pat forums has a discussion of the use of Microdyn and one person suggested grapefruit seed extract as an alternative.

Some people:

  • Treat all vegetables with Microdyn. Some people only treat the fruits and vegetables that are not peeled. Some people don’t treat their vegetables
  • Wash their vegetables in tap water. Some do so in purified water (either bottled or from their home purification system)
  • Treat vegetables that they don’t cook

Others think:

  • Treating their produce with vinegar kills the harmful bacteria (not all bacterias are harmful)
  • Air-drying washed dishes and utensils air-dry kills the bacteria
  • Chlorinated water will kill any harmful bacteria

What Are We Protecting Ourselves From?

There are probably two concerns:  1) fruits and vegetables may have been mishandled so that they were exposed to contaminants, and 2) if they have been washed, whether at home or prior to the produce reaching the home,  the water used may have had contaminants in it.

Tap water can become contaminated in several ways, but the two major culprits are 1) septic systems located near water supplies and that leach bacteria into the water supply or 2) municipal water supplies where water pipes might have become weakened over time (the walls of the pipes, for example, becoming thin through rust or corrosion or other age-related degeneration) and where they are located near sewage or gray-water drains.

Some people believe that if the water is under pressure it is not susceptible to contaminates intruding through pipe walls.

Elements of water purification may include filtration using various mediums, distillation, and treatment with chlorine, ozone, ultraviolet light, and carbon dioxide.


There’s a critter (a parasitic protozoa) named cryptosporidium parvum that’s transmitted by fecal contamination. In people whose immune systems work properly an infection triggered by cryptosporidium can be uncomfortable; however, for those whose immune systems have been compromised (and those who are very young, pregnant, or elderly), infections triggered by cryptosporidium can be a significant health risk.

Cryptosporidium is extremely resistant to chlorine and the United States Centers for Disease Control and Prevention identifies three methods for treating water:

  1. Reverse osmosis
  2. Distillation, and/or
  3. Filtration through a filter of “absolute” 1 micron or smaller porosity

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