The following quote is by Bill Pierce and appeared as Rodinal Re-jiggered in Popular Photography (Sept 1966).
"When diluted 1:100 with 7.5% sodium sulfite solution, Rodinal may be used as a deep tank developer. Replenish with 1 ml of Rodinal for each roll of film. The replenished solution keeps for one month. Decrease development times by 20% from those used for Rodinal diluted with water. Used in this manner, Rodinal-sulfite becomes a medium fine-grain developer producing prints with very clean highlights."