3 monthly doses liquid. Helps prevent septic back-ups (Along with occasional pumping). No.1 brand septic professionals have used in their own tanks (Among septic professionals who have recommended a septic treatment product). Scientifically proven to break down waste. RID-X contains 100% natural bacteria and enzymes proven to break down household waste and help prevent septic backups. 1st dose. 2nd dose. Health. Hygiene. Home.