We first purchased Grease-X to give it a try. I was very skeptical about how it would preform, because we have used other products and we didn’t see results that made it worth all the money. We had a customer in a commercial location who was having weekly backups in different locations throughout his store. He didn’t have a lot of money to keep throwing into the building. We talked him into a Grease-X treatment in the problem drains and we haven’t been back to clean the drains since. The product works great and it’s priced great. I will continue to use the Grease-X product.