I put about 2 oz per 16 oz bottle, so, 1:8 for me.

Now, the stuff I get is concetrated...thicker than shower gel...I've seen other brands of chlorhexidine that are a lot more watered down, so your mix may be different.

When you get it, you'll want to play with it to see how much you need to dilute it. You want it to get frothy but not leave a slimey residue after you wipe it off. Just takes a little trial and error, thats all.