I'm with arla looking to go every other day collection so I'm after a 15000-16000 litre tank which I think is big enough for 4 robots once the 4th goes in. I'm struggling to find a used tank so I'm pricing new tanks up. I'm getting quotes for mueller, fabdec and roka. Roka is chunk cheaper so I'm wondering why? I've also heard fabdec have had issues with some tanks, has anyone else heard this? So far I'm favouring mueller tank because of the compatibility with robots and ability to link it to the CRS to call me if tank isn't working properly. Lely are also apparently pushing the mueller tanks to be sold with there robots.