Biotal STC is a high active, non-toxic concentrate of viable, naturally occurring microbes which boost the biological activity of a septic tank by replacing bacteria destroyed by household chemicals. Used as directed, Biotal STC will help keep the septic tank in prime condition, odours will be eliminated and servicing and maintenance costs reduced. Biotal STC contains organisms to degrade proteins, carbohydrates, cellulose and fats and is stable, robust and highly active.