and temperature are useful adsorbents to increase the mass of natural gas within a tank a further selection of these carbons is based on their particle size which should be a size that is easily conveyed pneumatically in a stream of an inert gas for example nitrogen in exemplary implementations a particle size range of between about 150 to about 400 mesh is useful these carbons are very flammable and thus they are normally stored wet to reduce the danger of fire or explosion during handling and shipping prior to be placing in a tank the carbons are dried in an oven or air heating and drying system at 110 u00b0 c with or without a vacuum and immediately conveyed into storage tanks preferably the transfer of the carbon is pneumatically in an inert gas atmosphere zeolites mofs and carbon are all considered toxic hazardous materials for respiratory inhalation it is critical to keep these materials contained within the system after the storage tank is filled under a minimal pressure for example about 30 psia with the carrier gas the tank is allowed to equilibrate at atmospheric pressure a special valve fitting is installed with a supported membrane or fine filter between the tank itself and the regulator in exemplary implementations the pore size of the filter in between about 0 1 and 0 3 micrometers in one aspect the membrane or filter is supported on both sides with mesh to allow both high pressure filling of the tank and.