There is nothing that "burns" THC out of your system.

THC is stored in your fat cells. When fat cells burn for energy, the THC metabolites are released back into the bloodstream and make an eventual exit via the urine and bowels. This is the reason why THC has a longer detection period than other types of drugs. Only time and fat-burning exercise can permanently rid the body of THC.

However, THC metabolites (THCA) that are present in the bladder can be diluted by drinking fluids. This reduces the THCA concentration in the bladder to the point where the urine sample falls below the cutoff thresholds of the drug screen. This is only effective on the day of the test. Its a balancing act and the effects are only temporary - once all of the fluids consumed had been urinated out, a "dirty" donor will resume testing positive for THC.

For the proper method of diluting, read this thread: http://boards.cannabis.com/drug-test...uidelines.html

Dilution techniques in any configuration can backfire if the THCA concentration in the bladder is too high. For most heavy smokers, its virtually impossible to dilute the THCA concentration without overdiluting and sending up red flags at the lab.