Just set my Maxi doser up after a few trials with updating the FW but the latest versions now have worked for me.. (thanks Marco and Matthias) Set up is very straight forward and is just like the 2.1 doser. This doser really is a Beast, i was hoping it would prime and pull water 60 feet from my garage and it does!!! This is going to make my life so much easier that it does this, I wasn’t really expecting it to tbh. I have calibrated both dosing heads at speed 2 and they have virtual identical volumes of 155 and 158ml/min which is great and shows the long distance doesn’t affect performance. Now I just need to set up for AWC not sure of the best way to do this yet, maybe just 10L a day in and out using the timers, with simultaneous running, any suggestions of a better way?