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BioSphere has been designed to overcome the hurdles that other biodegradable technologies face, and offers a valuable cost difference. Unlike other biodegradable plastic additives, Biosphere allows the microbes in both aerobic and anaerobic environments to consume plastic from deep within—not just on the surface—and works much faster than other technologies.
Bio-additives are surface dissolving products that allow microbes to dissolve the surface of products by reducing the weight and shape of the plastic over time.
Each polymer has a set of microbes that secrete enzymes for that plastic. Some microbes also secrete enzymes that consume different plastics. For example, some polystyrene microbes secrete enzymes that work on polyethylene. Some companies sell numerous products for individual resin types, but this is mainly for processing purposes. It is not designed for biodegradation at optimal rates, according to our independent testing of these products. Biodegradation of each product will work differently. Most will compare to one another after 30-40 weeks of biodegrading at the same rate, but each has different optimal times. 
When secreting their enzymes, microbes have a tough time breaking certain bonds within the polymer chain on their own. Bio-additives allow microbes to work together to break down a product. Bio-additives also make plastic products hydrophilic, allowing microbes to use the biodegradable additive compounds to dissolve the plastic and turn it into dirt. The microbes are only able to eat from the surface of the plastic and not from the middle of the plastic, causing a slower decomposition time of the plastic.
Many biodegradable additive companies sell their products worldwide, these biodegradable plastic additive companies test their products using the testing method ASTM D5511 or ASTM D5526. This testing method is for environments with no oxygen (a landfill environment). Bio-additives are useful in these environments. Bio-additives allow the bacteria and fungus to dissolve the plastic layer by layer. This makes the plastic product maintain its original shape, rather than break into pieces. This reduces the weight of the plastic much more easily than oxo-degradable plastics. 
While bio-additives do work very well, the surface area of the plastic is generally kept the same in most cases. We do however find that pits or holes on the surface may slightly increase the biodegradation, though it still does not allow the microbes to fully dwell within the plastic structure itself. This explains why most items after testing still maintain their form and shape.