To remove disolved solids and another step in purifing your water you might want to concider solar distillation.

Here are some links.

http://www.thefarm.org/charities/i4at/surv/sstill.htm
http://www.rotarnet.com.au/users/9/9520/SolarWater/swp.html
http://www.davesplanet.net/solarstill/
_________________________
When in danger or in doubt
run in circles scream and shout
RAH

And always remember TANSTAAFL