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The composter can be filled with compost, which is done by adding compostable items to it. When successfully adding an item, a green particle appears. The table below lists supported items, which have different levels of compost-ability. The higher the percentage of an item, the more likely it is for it to add another layer of compost. Each layer of compost has a podzol-like appearance. When the composter reaches the 7th layer of compost, the compost changes appearance indicating that bone meal can be collected by using the composter a final time.

The following table shows the items that can be used in a composter, the percent chance for an item to add a level of compost, and the average number of items needed to fill a composter. Smaller pieces (such as individual pieces of wheat, melon slices, etc.) produce more compost than the blocks or other items that can be made from them.

30% 50% 65% 85% 100%
Average number of items required to fill a composter
~23.33 14 ~10.77 ~8.24 7