Easiest way to re-fill Adblu is to use the pump at a Petrol Station,there are two different nozzle types,I prefer the shorter nozzle with the lance type handle for ease of use. I’ve had similar Adblu related experiences,in several years use I’ve re-filled tank with varying amounts ranging from 2L to 20L when light has come on/counting down. Using a new 10L container of Adblu is awkward to hold at required level while getting flow rate correct. Try the pump,you’ll not regret it,plus works out cheaper per litre for me
