Barry Thornton quote:

"The film is ’developed’ in Bath A with agitation every half or full minute -it’s not critical. Actually little development takes place. Mostly the film is becoming saturated with the developing solution. However, some development does take place and agitation is important to prevent streaking. The solution is then poured off and saved. Drain the tank well but don’t rinse or use a stop bath. Then pour in Bath B, and after a quick rap of the tank on a hard surface to dislodge any airbells, let the tank stand still with no agitation for three minutes or so when all development has ceased. Note, though, that while no agitation is ideal, and usually works well for unsprocketed roll film (120/220), there can be streamers from 35mm sprocket holes. This seems to vary with different kinds of tanks, different films, and the local water characteristics. Do your own experiments to determine the minimum agitation you can achieve without streaking before committing a crucial film to the process. Perhaps try one minute intervals to start with."

I'm using Kindermann stainless steel tanks with 120 and 35mm film.
I don't agitate Bath B,never had any kind of streaking.