There are two types of pump sprayers, the first type is called Hand Pump Sprayer, when using it, the user continuously keep pumping the machine with his/her hand during the spray. The second type also make use of pump but its called Pressure Pump Sprayer. In Pressure Pump Sprayer, user don't have to continuously pump the machine while using. In Pressure Pump Sprayer, user first fill the machine with solution and then pump it to make pressure in the solution tank. Once enough pressure is built, user can use it until the machine gets empty or pressure is dropped at certain level (depending on the selected model). Pressure based Pump sprayers are cost effect as compared to engine or power sprayers. They are easy to carry and use.