I am very allergic to pesticides and have been putting up with several armies of ants and snails for years. I finally called Hydrex because they specialize in people just like me, who have asthma and allergies and have to be very careful. I was quite impressed. They are a harsh chemical free company. I didn't even notice the treatment. My ant problem continued because it was so bad and they came out two more times without an additional charge. I now routinely use them every two months and the bill is cheap. Highly recommend!