If your toilet bowl is or has been filling slow lately then you will need to repair either the internal toilet parts or possible the supply line or valve that feeds the water into your toilet. The broken toilet parts that are causing your toilet to fill slow can usually be bought right a local Home Center like Home Depot, Lowes, Wal-Mart or even right online from a website.
There are a few parts that will create a situation where your toilet starts to fill really slow. These parts inside of the toilet bowl will or can include the Toilet fill Valve, Toilet Supply Line or the Toilet Supply Valve. The first thing you need to do is to determine which of these parts are bad so that you can replace it.The reason your toilet is filling slow is because the water pressure is being restricted by one of the parts that have gone bad. If you replace the toilet supply valve, toilet supply line, or the toilet fill valve your water pressure to the toilet will increase and your toilet will start to fill fast again like it did before it started filling slowly.
You will need some basic plumbing hand tools to replace the toilet fill valve and the supply valve and the toilet water supply line. These tools include an adjustable wrench, small pipe cutter, and a Flathead screwdriver. Before you or the plumber work on the toilet, you will need to shut the water supply off by shutting the water main. If you are working on the internal parts of the toilet you can shut the toilet supply valve that is on the wall or the floor. The Toilet Fill valve can be replaced by shutting off the water to the toilet and then disconnecting the toilet supply from the bottom of the toilet fill valve. Once you have the water supply line removed you can remove the nut that holds the toilet supply valve in place and then remove it from the toilet bowl tank. Once you have removed the old toilet fill valve you can replace it with your new one.
If your toilet supply line is clogged or is defective and you need to replace it, you will need to shut the toilet supply valve off and then disconnect the toilet supply line from the valve and then the remove the other end from the toilet fill valve. Here is a picture of a replacement toilet supply line. If you need to replace the toilet supply valve the water main to the house will need to be shut off. Once the water source is shut off you can replace the toilet supply valve. Here is a picture of the toilet supply valve in a chrome finish.