If you are going to dillute, go with the dillution sticky on this forum. Any product from GNC will probably not remove THC. Also, since you work out so heavily stop at least 3 days prior to your UA and eat up on fatty foods. Working out will release more THC metabolites into your urine. I went through the same thing and was getting inconsistent home test results because I was doing a ton of running. If you go dillution then sub gatorade for water.