Septic tank
Septic tank additives have been promoted by some manufacturers with the aim to improve the effluent quality from septic tanks, reduce sludge build-up, and reduce odors. These additives are usually expensive in the long term and fail to live up to expectations. It has been estimated that in the U.S. more than 1,200 septic system additives were available on the market in 2011. Very little peer-reviewed and replicated field research exists regarding the efficacy of these biological septic tank additives.