When will all the degradation product is water, bio-mass. Methane and carbon dioxide, which of these things is essential to the growth and life of the plant so it does not harm the environment.
When digested down The products are water, carbon dioxide, methane and biomass. These are essential for the growth and survival of plants. It does not harm the environment
When everything is decomposed product is water, biomass, methane and carbon dioxide. This is essential in the growth and maintenance of the plant. It does not harm the environment.