Bought for cleaning gutters. They were in a state of neglect, there was water in them. If there is too much dirt, then you need to either patiently knock it down in short sections, or first partially select it, and then rinse it. But after washing the gutters sparkled from the inside, the water ran! Haven't used it seriously yet for pipes. But there is one feature - the hose is harsh. If there are several bends on the way, you will have to tinker so that the hose crawls through everywhere