First off, Alterra service techs beg people to jump on here and give them good reviews because they get paid extra for them...I would have given Alterra a higher rating but their product is worthless. They actually have a much stronger product in their arsenal but apparently you have to keep calling and calling, in my case 5 times, along with two emails to managers, an email to corporate and two unreturned phone calls before they will use it. Here's the deal, their salesman are great, their service techs are also wonderful but the people behind the scenes and the product itself is horrible. After the initial spray, I literally saw more spiders and bugs than before so I called them back twice over the next two weeks...no results. So, I called Alterra and told them that the product was ineffective and I would like to cancel,which they were glad to do, for $199!!! You know who does stuff like that? Companies who know you are not going to be satisfied! PLEASE do not waste your money or support this company.