This however is not true. This tool has many purposes to it; it all depends on how you can handle it. On an industrial scale these washers are used to cut through materials. Such pressure washers are known as hydro blasters. As the name suggests they use water as a medium to cut and clean.Hydro blaster is rather a special type of pressure washer. It would not be wise to purchase such a pressure washer for home use. Domestic pressure washers come in a variety of types. The very first difference is the power source of these washers.