DrainScrub from Helix Laboratories is an enzyme drain and septic cleaner designed for septic field rejuvenation. Mix the powder in water and pour into the tank and field through the vent, distribution box, or clean-out. Billions of microbes are reintroduced and digest the clogs and restore proper drainfield function, according to the manufacturer. 877-444-3549; www.drainscrub.com.