Pyro users: do you use Hypo clearing agent following fixing of your film? If so, why? At what strength (e.g. 1%, 2% solution) and how long? If you don't use it, why not?

Hypo clearing agent (Sodium sulfite in water) affects the stain of anti halation and pyro. Cole Weston used it on a number of his father's negatives (ABC pyro), Bob Herbst and Sandy King use

it as part of their pyrogallol or -catechine processing routine. Others, for instance Steve Anchell, advise against using it.

In responding please make clear if you refer to anti halation stain, pyro image stain, or pyro stain of film base plus fog.

I am interested in comments based on research and/or experience.

Thanks.