"Sodium nitrite is a safe and effective chemical used for the biological control of wastewater treatment. It helps maintain proper pH levels in wastewater, control sulfide odors, and reduces the demand for biological oxygen. The compound is also proven to be one of the most effective collectors of sulfur dioxide. Due to its odor-absorbing properties, and is used in deodorizers for carpets, refrigerators, and garbage containers. It is even used in the agricultural industry as a buffer to maintain the pH levels of rumens and alleviate butterfat depressions due to diets low in fiber and to aid in fiber digestibility. In the poultry industry, sodium nitrite is used to maintain electrolyte balance, improve tolerance to heat stress, and improve eggshell quality."