A vessel is disclosed, the vessel including a main body having a hollow interior for receiving a fluid therein, wherein at least a portion of the hollow interior includes a filling material disposed therein to minimize a rate of flow of the fluid from the main body, wherein the filling material is at least one of a porous structured material and a granulate material. The converter-controller does not need a snubber circuit. The decompressor is configured to reduce pressure of at least an area between the medium and said nozzles of said inkjet head to a value lower than an atmospheric pressure of 1 atm.