Had one of these for a few months months and have been pretty hit and miss with the refills. Usually I'm only getting about 100g in the cylinder and it's kind of annoying (except that one time I managed to overfill the cylinder to 1.6kg!). I've been keeping the cylinders in the freezer and emptying them before the refill, but I'm wondering if there's something I'm missing?
I'm using the octagonal adapter. I have a SodaStream brand cylinder and a Kegland brand, neither of which seem to be better than the other. I always get a good filling sound straight away, but then it stops after about 10-15 secs.
Pretty sure there's still plenty of gas in the tank, it's 15.5kg and I think the tare is 12kg (off the top of my head).
Cheers
Just hook it up direct to your soda maker, so much easier.