Welded wire bins/rings are best
by Gardener Ed
(Tallahassee, Florida, USA)
Welded Wire Compost Rings
Welded wire compost rings are the best compost bin. They meet 8 of the 10 criteria. I use 16 foot lengths of 4 foot high 2x4 welded wire, 12 1/2 gauge.
While they are made of galvanized wire, the steel in the wire may be made of recycled steel. So this meets 9 of the 10 criteria. If you live outside of the city, rats and mice are usually not a problem.
They will last for 30 years or more; mine have.
They are free standing and need no additional support. Simply coil the wire fencing to the desired diameter; 3 feet minimum and 5 feet maximum and lace them together like tying your shoes. If the ring is too narrow there is not enough mass to retain heat. If too wide the center doesn't get enough oxygen.
They are easily unlaced, unwrapped, and moved adjacent to the pile for turning.
Women and older men lacking upper body strength may prefer wire fencing that is three feet high.
This wire fencing is usually sold in 50 - 100 foot lengths. You can make three rings with the 50 foot length. Three families could share the cost if they only want one ring.
These compost rings allow maximum air circulation and are self camouflaging; especially if you paint them black. Coil them up tight for storage or transport.