The Joe Cell is a kind of Cyclotron
A cyclotron is a compact type of particle accelerator in which charged particles in a static magnetic field are travelling outwards from the center along a spiral path and get accelerated by radio frequency electromagnetic fields.
In a similar way the Joe Cell has it’s own dynamic generated electromagnetic fields which attracts orgone energy (maybe a kind of scalar energy) into the center of the cell and saturates the water until the excess of energy can be lead towards the engine block.
This is the main reason why the stainless steel should not have any magnetism on it’s own. Avoiding unnecessary treatments of the steel is therefore preferable.