I had to take a pre-employment piss test the other day and I had only stopped smoking every day for two weeks. I took a flusher, STRIP, that i bought at gnc and it tasted like crap and made my piss diluted. so never get it. i then had to retake the test two days later, so i went back to gnc and bought a different flusher, Q-Carbo. It was only 16oz, tasted like fruit punch with a little bit of a kick. Drank 16 more ounces of water, gave it an hour, and i was good for the next 6 hours. I passed, and I'd recommend it to anyone.