Although this product reduced the problem immensely for a short time, it didn't stop the problem. I used the gel until it was all gone (8 days): by the 3rd day, I didn't seen any insects in my bathtub - I was thrilled and continued to use the gel as directed. By the 4th day, they began returning a few at a time. By the 6th day, they were back in numbers again, though not quite as many as before I used the gel. By the end of the bottle, they were back to parading around my bathtub - seems they developed a tolerance to the gel.