Well, you don't have to really use "massive amounts of air to produce it in tune.
Step one play descending octave slurs starting on third space C. (Descending C major scale.) When you hit F (1) , play the low (false pedal F) 1+2, The E (1+2) to false pedal E 2+3, D (1+3) to false pedal D (1+2+3) - then C (0) to pedal C - open valves and open water key - the note come out in tune. Maintain normal full air support and tone for each tone. The descending octave pattern trains the player to coordinate the factors (air, tongue, embouchure (lips + tongue), to play in the lower range. With practice it becomes possible to play the pedal C with the water key closed. The ease of doing this depends on the horn/ mouthpiece/embouchure setup. I find on most Bb trumpets it is easy to play pedal B or Bb open in tune and then descend chromaticly (2 - 1 - 12- 23 - 13 - 123) then go down to double pedal notes. There are few pieces which actually use this register (Rogers in the variations on auld Lang Syne uses pedal Bb at the end of the second variation. This is for cornet however, and he ease of playing pedal notes is greater than on most trumpets.
Fort Lewis College
(former cornet soloist - the "President's Own" Marine Band)