> streak-proof agitation(posted 8515 days ago)For example, use a double-size tank and put a reel loaded with film on the bottom and an empty spacer reel on top. Use just enough solution to cover the bottom reel.
When you pour the developer in, bang the tank a couple of times, then invert continuously for the first 30 seconds, followed by two inversions every 30 seconds or four inversions every minute, whichever you prefer.
All that's required is the big air space; seven reels in an eight-reel tank will work ok as long as there's one-reel-worth of air space.
This doesn't cause any sprocket-hole streaks or defects etc; actually those are caused by insufficient agitation.
The only potential drawbacks I can think of is that it may cause excessive aerial oxidation when using PMK or another developer that's very easily oxidized, and it may cause excessive foaming with some developers. The cure to foaming is a drop or two of Edwal LFN in the developer.