I would'nt fool around with dilution it's a pre-emploment ua. I would sub with qf it's fool proof and has a 100 percent success rate if you get the temp right. I used it and keep a bottle handy for randoms. I was going for a six figure salary and with the economy the way it is missing a good job opp. is not an option and I have randoms so qf is my best bud.