Lee B. wrote:
we will die. Koi need certain levels also - HOWEVER, the *normal* ambient
background salt in most water supplies is sufficient for their needs. At
least here in Central Florida. Don't know about the rest of you folks.

This would be a problem in areas where people used rain catchment
systems, such as in rain forests or areas with nasty water in the
public utility. Thanks, I'll try to remember this.