Good day. I have looked thru but can't really find an answer to this. I ordered and received the Photographers' Formulary PMK PYRO-METOL KODALK DEVELOPER and have never used this before. It's the 25Liter volume. Of course I can't use the entire 25 liters at first but I don't have a scale. How would you recommend proceeding please for my first mix use? My jobo bottles are 1000ml so I'd like to start there. Which reminds me, is this Pyro good for a rotorary drum? Thank you for any help.