All thing considered I have decided to switch to potasium oxalate for palladium printing, even though it is a bit more expensive than sodium citrate. But I have two questions.

1. Do you need to replenish the developer or is it sufficient to just add back what is lost during processing?

2. How do you deal with the build-up of metal in the used developer? Can you filter this out or do you need to decant from the top?