Review (5/5): Important Maintenance I was told by Goldstar A/C service.
I had sludge in my pipe and he told me to buy it to keep the pipe clean to extend the life of my a/c heating unit. It was easy to use just lay it in the drain pan. So far we have checked and the pipes are still clean since he came to clean them out. It is easy and much less expensive than having a service man do it. I saved 80% buying this product.