I think the measurements may be a bit off.
The old (200G) buckets aren't quite a right cylinder but they are close. The diameter is 27 cm with a height of 44 cm. This gives a volume of 25,200 cc or 25.2 l which is about 6.5 US Gal.
The new buckets (I don't have one of them to measure) are 160G (vs. 200G). If we reduce the volume by 160/200, we get an estimated volume of 5.2US G.
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