Activators really speed up the process and are sold in the garden centers. In general, they are rich in nitrogen and other concentrated amounts of items contained in any well-maintained compost bin. The preparations on a bacterial basis contain bacteria and enzymes that accelerate the process of composting. These microorganisms are also contained in well-maintained compost.
These preparations are needed when the composter is not placed directly on the ground. There are a number of nitrogen-rich compounds that you can get for free. For example: freshly cut grass, nettles, coffee grounds. Probably the easiest the available activator for compost is human urine. Due to its rich content of nitrogen and other trace elements, it has been added to compost piles for centuries. If you are engaged in organic farming, to activate the compost can be use only mixtures based on microorganisms or plants that are not biologically modified.