A sewage backup is a health and sanitation problem that needs attention before you think about products.
Safety: Avoid contact with sewage. EPA guidance recommends contacting your local health department/regulatory agency or a septic professional when a system backs up.
Possible causes
Backups can be associated with poor maintenance, excessive hydraulic loading, component problems, or drainfield/system failure. Diagnosis requires the actual system to be assessed.
Avoid trying to mask a failure
A backup or failed drainfield needs the underlying cause diagnosed and addressed. Address the underlying cause.
Useful next reads: maintenance guide · warning signs · septic additives evidence