There are three common ways of agitating the film:

  • a) Gently tilt the tank twice every 15 seconds
  • b) Gently tilt the tank for the first 10 seconds of a minute and then let it sit until the minute hand reaches zero again.
  • c) Gently tilt the tank every 3 seconds (Tetenal Rhythm)

Select the rhythm from your developing timetable or manufacturers indication on your developer bottle.
In most cases you will be using method b.
Place the tank in the bucket of water while not agitating it if your room temperature is off by to much.