Another heated water hose question

Does everybody understand how a freeze-proof hydrant works? The valve is below frost line. When you shut water off flow stops, but also opens ports to allow water in pipe to drain into a gravel bed, then out into soil.
If a hose is hooked up the stand-pipe may not drain. For your convince of not using tank you might need to replace the filter. But the owner of CG may need to dig up, and replace the hydrant.