Bio-Tab 1T from Bionetix International can be used to treat undigested sludge to help keep septic systems healthy and functioning, according to the maker. Each tab contains a 1 trillion count of bacteria as well as enzymes effective in aerobic and anaerobic conditions. Biological nutrients and stimulants enhance the water biology in the tank by aiding bacteria to biodegrade organic material composed of proteins, fats, carbohydrates and toilet paper. It is designed to be efficient following toxic shock, such as the use of strong harmful chemicals like bleach or root killers. Two tabs are added to the tank in the first month, followed by one tab every month for maintenance as well as one tab after any toxic treatment. 514/457-2914; www.bionetix-international.com.