The patented “NON-PARA” UniTab® fights odors, cleans, descales, de-limes, removes and prevents corrosion, uremic salt build-up and waste build-up. Keeps fixture and drain lines clear and open. Contains acid-stable enzymes to prevent the formation of ammonia, the cause of urine odors. UniTab is patented is because it fights odors and maintains drain lines without p-DCB. The round shape is designed to fit over drain domes. Greywater and septic safe.