I can speak for dillution. I followed the sticky plus advice from members and it worked for me. I was a daily smoker and abstained for 25 days plus ate a high fiber diet, took metamucil and excercised more. I was passing dilluted at 7 days and passed naturally at 21 days. The other factor was abstaining from smoking. If you dillute the more time you have the better and forget about the aspirin its now outdated and sub gatorade for water.