from everything I've looked into the only thing that will remove the metabolite residue (the stuff they actually test) is hard exercise and time - there seems to be no miracle fix only diluting a sample by much water consumption will keep the levels low enough so as not to be detected but that does not mean your system is clean by any means - and everyones body chemistry is different so the length of time it stays in your system varies from person to person, body fat and metabolism really tend to determine how long it stays in your system. But really if you smoked an oz in an hour it's not likely you'll pass no matter how much water you drink and if you did smoke that much in an hour what a waste of good herb after a point. Good Luck tho!