Pre-pressurisation means that the sprayer is equipped with a pressure vessel which is filled with solution before use and manually pressurised using a pumping mechanism. This system allows the pressure to be maintained permanently without the need to re-pump every time the sprayer trigger is pulled. Pre-pressurisation is suitable for medium and larger gardens where a larger spray volume needs to be applied in a shorter time. This method is efficient and saves time and energy as the user does not have to pump continuously while spraying.