My developer develops grit like black pepper and also green crystals. I decant the developer off the grit sometimes and add a little water to dissolve the crystals. I am not very scientific about it but doesn't seem to be very problematic. I also sometimes add a little Oxalic Acid to the PO because I read you are supposed to do that to keep the developer acidic. I can't verify that ever had any affect on anything.
Originally Posted by Vaughn