A method for the economic production of containers made of thermoplastic material with the following steps: • supplying in each case one preform to a mold carrier of a blow-molding machine, which comprises at least one pressure chamber of lower pressure and at least one pressure chamber of higher pressure, wherein in the pressure chamber of lower pressure a pressure prevails, which is less than or equal to the pressure in the pressure chamber of higher pressure; • applying at least a first pressure to the respective preform in the mold carrier for pre-blowing the containers; • final blowing of the containers carried out with at least a second pressure, which is provided by way of the pressure chamber of higher pressure and which is greater than the first pressure; • at least partial venting of the finished blow-molded containers into the pressure chamber of lower pressure, and pre-blowing and/or carrying out further blowing steps for manufacturing the containers from the chamber of lower pressure; • wherein a control is provided, by means of which the pressure in the pressure chamber of lower pressure is kept substantially constant during the pre-blowing and/or other blowing steps and the venting, characterized in that a lowering or raising of the pressure level of an external pressure accumulator is regulated in such a way that a desired curve regarding the increase of the pressure and the decrease of the pressure respectively is achieved, so that a maximum volumetric flow of blowing agent from the pressure chamber of lower pressure to the external pressure accumulator is controllable by a target pressure in the external pressure accumulator, whereby the pressure in the pressure chamber of lower pressure is kept to a level as constant as possible. • supplying in each case one preform to a mold carrier of a blow-molding machine, which comprises at least one pressure chamber of lower pressure and at least one pressure chamber of higher pressure, wherein in the pressure chamber of lower pressure a pressure prevails, which is less than or equal to the pressure in the pressure chamber of higher pressure; • applying at least a first pressure to the respective preform in the mold carrier for pre-blowing the containers; • final blowing of the containers carried out with at least a second pressure, which is provided by way of the pressure chamber of higher pressure and which is greater than the first pressure; • at least partial venting of the finished blow-molded containers into the pressure chamber of lower pressure, and pre-blowing and/or carrying out further blowing steps for manufacturing the containers from the chamber of lower pressure; • wherein a control is provided, by means of which the pressure in the pressure chamber of lower pressure is kept substantially constant during the pre-blowing and/or other blowing steps and the venting, characterized in that a lowering or raising of the pressure level of an external pressure accumulator is regulated in such a way that a desired curve regarding the increase of the pressure and the decrease of the pressure respectively is achieved, so that a maximum volumetric flow of blowing agent from the pressure chamber of lower pressure to the external pressure accumulator is controllable by a target pressure in the external pressure accumulator, whereby the pressure in the pressure chamber of lower pressure is kept to a level as constant as possible.