For stoners you guys dont know much about thc and how its stored in the body. THC is stored in fat and has a 7 day half life in the body. Meaning that if you smoke a joint it will stay in your system for up to 7 days, if you smoke after again (lets say on the 5th day since you last smoked) you now have 9 days before your clean. The more you smoke, the more your body is saturated with thc in your fat cells. Heres where you have a problem, if you drink as many gallons of water as you want your only diluting urine while your body is still breaking down fat and releasing it into your blood stream which eventually makes it through the kidneys and then to the liver, which is then passed in the urine sample resulting in a failed test.
The way the blockers work is that they prevent the liver from processing any new chemicals or food materials by coating the liver with a gum type material. It will only let the stored water that you are instructed to drink with the kit remain to be used. You are instructed to pee several times after drinking the kit or solution to pass the dirty urine through your system to be followed by pure water which contains b vitamins and colour to resemble urine, thats incase its beeing sent to the lab for a lab test. Your standard dip stick test doesnt care about the added content because its only job is to detect thc.
I did a few years on probation and had to piss up to 3 times a month. I even failed a few times by using generic crap and had to do time because of it. I dont recomend gnc products at all. I do recomend a drink called 420 cleanser, it is the most trusted and reliable drink on the market and was scientifically designed. It is pricey around $60 dollars for the big bottle. But its worth it when freedom is on the line. I would spend around 300 a month on that stuff 5 years ago.