When you start treatment, dialysis solution—water with salt and other additives—flows from a bag through the catheter into your belly. When the bag is empty, you disconnect it and place a cap on your patient connector  so you can move around and do your normal activities. While the dialysis solution is inside your belly, it absorbs wastes and extra fluid from your body. After a few hours, the solution and the wastes are drained out of your belly into the empty bag. You can throw away the used solution in a toilet or tub. Then, you start over with a fresh bag of dialysis solution.