R3 MONOBATH DEVELOPER can be used again and again and replaced in the bottle. It lasts through many rolls and sheets of film. It also has excellent keeping life on the shelf.
The solution does develop the "sludge" common to most monobath developers. This is the fixed out silver which is for the most part harmless. It may be decanted away in a coffee filter to improve the condition of your solution.
Consult the R3 MONOBATH DEVELOPER Resource Page for further information.