A pushing-dispensing and/or dosing element for dispensing of medium, in particular Composite Heavy Fluid Compound (CHFC) or plurality thereof solves technical problem of implementation of a pushing-dispensing and/or dosing element that will not have sliding and/or moving parts, or it will have a limited number of said sliding and/or moving parts essentially exposed to medium, preferably CHFC, or plurality thereof by using a flexible cartridge that behaves differently during the pushing of CHFC, and differently during pumping of said CHFCs out of the tank in which they are held.