I need to buy a composter or two for my new city garden and would appreciate some advice, please? From information supplied by my local council I see there are two sizes - 220 and 330 litre. The 220 litre is 740 cm in diameter and 900 cm in height. The 330 is 800 cm in diameter and 1000 cm in height. Is it enough to buy one or is it better to go for two and which sizes do you suggest? I shall look forward to hearing from you.