can you pour into septic tank directly? will it also clean the drain field?

Good Morning; Best application is directly through the toilet so it brings bacteria to the entire system. The drain field is included in this application. If you are experiencing a sluggish or poor drainage issue with the drain field apply a second application 10 to 14 days after the first. If you have any trees 20 to 40 feet away from the drain field also think about adding K-77 Root Killer to the system a week after your K-57 applications. Root intrusion is very common and creates the same problems of poor drainage as heavy sludge build up.