The doctor said distilling doesn't kill the Giardia so is my CS contamenated?
According to these sites distilling elliminates Giardia. Maybe remove the carbon filter in your distiller to keep contamination out of your Colloidal Silver .
I wouldn't drink the pink silver. Some how your distilled water your are using is getting contaminated. Yellow silver is ok. You can drink quite a bit of good Colloidal Silver without any known risk.
Just don't let anyone including pets drink directly out of your well.