Quote Originally Posted by Gerald C Koch View Post
Developers based on pyrogallol or catechol, especially in dilute solution and limited sulfite content, may not respond well to rotary processing. These developing agents are very sensitive to aerial oxidation. A rotary processor is constantly introducing oxygen into the developer.
RE: HC110 - I have yet to have problems. Maybe the Unicolor rotating base is slow/gentle enough. I've used numerous dilutions (from B to H). I do drop the dev time by about 20% as per recommendations around the web though.

EDIT: No presoak either.