cockroach issue is one of the biggest issue. it was giving a lot of pain to us as the growth in the house was very difficult to control. we tried expensive pest controls, all sprays, glued traps, gels, chalks what not. just last month i tried this advion roach gels and now my house is completely roach free. i first tried one tube, after seeing the incredible results i purchased more than i actually needed. now i have few extras left unused, if anyone needs can buy qr 70 each.