I had the same problem with Clear Flush. It was supposed to be made for higher toxin levels, but when my results came back it showed positive on both tests they did. And that guarantee is horseshit. They refund your thirty bucks, but you have to pay 25 bucks just to get the paperwork for the refund. And price isn't a factor either. I've spent 20 on a cleanser and it has worked, so I know from experience. I think it all depends on how clean you are more than the 48 hours they tell you to be clean. The time I passed I had been clean for a week before.