To clean the Westfalia water tank,two teaspoons of bleach per five gallons of water left over night, then flushed out with fresh water from a trusted source.This will sanitize your tank and lines before filling with safe water.
If the source isn't trusted, the same amount of bleach, two teaspoons of bleach per five gallons.Bleach kills all bacteria and viruses, and dissipates after several days.

Boiling . Kills all bacteria and viruses within 3 minutes.

Water purifying filters- Removes bacteria from un-trusted source of water before it goes in tank, or before it reaches faucet.

Robert1982 Westfalia

      From: Dennis Jowell <dennisjowell@GMAIL.COM>
 To: vanagon@GERRY.VANAGON.COM
 Sent: Sunday, May 29, 2016 5:17 AM
 Subject: Onboard water supply?

. What is a correct procedure to clean the onboard water supply to the sink faucet which I use as drinking water also. I came down with something as we traveled through Ontario camping. I think I did this wrong. In fact I may not have done anything with the water only filling it up trying to get out of town, ugh!
Had to cut our planned trip short.
Is there a water filter that's recommended to use while using a camp ground water supply?
Dennis J

Dennis Jowell
Scotch Hollow Farm
Newbury, Vermont