Quote Originally Posted by stevew247365
okay thanks for the reply's, my last question is how long would it generally take to get from the .50ng to .15ng, are we talking days of exercise and lots of water? or can take up to a whole week?
A 50 ng assay screen is functionally equivalent to the 15 ng GC/MS. Their cutoffs numerically differ because the assay screen recognizes all 31 metabolite concentrations combined; while the GC/MS only recognizes one metabolite concentration: THC-COOH.

Exercise is only helpful in the weeks leading up to the test. Exercise should be avoided entirely 3 days before the U/A. Exercise burns fat cells, which releases the stored THCA into the bloodstream. The kidneys filter the THCA from the bloodstream and deposits them into the bladder. For 3 days you want the body to go into "storage mode" by not exercising, eating large meals and being lazy as possible to avoid releasing a bunch of THCA into the bloodstream, which will end up in the urine to be detected.

Drinking a bunch of water days or weeks before the U/A is of no help. THC is fat-soluble and not water-soluble. Therefore you cannot "wash away" THC from your body like you can wash away dirt from your car. Pounding home gallons of water daily may cause frequent urination, but it has no effect on the rate in which THCA is filtered from the bloodstream by the kidneys.
Drinking water is only helpful on the morning of the U/A as part of a dilution technique. Dilution techniques serve to dilute the THCA concentration thats present in the bladder, to where the urine sample registers below the cutoff limits of the assay screen. Dilution techniques are only temporary. Once all of the fluids consumed had all been urinated out, the "dirty" donor will resume testing positive for THC.