Quote Originally Posted by Tim Gray View Post
I do 1:300. Seems to work for me. With my current water, 1:200 was too much, and less than 1:300 wasn't enough.

It works out to 1 drop from my dropper per oz of wash water, so it's easy to measure.
One drop per ounce is probably more like 1:350 to 1:560.

http://en.wikipedia.org/wiki/Drop_(unit)