This bio-blend is specifically formulated to keep drains running freely with regular treatments. It breaks through the slime and grease that often builds up in drains to cause blockages and slow running drains. By attacking the drain build-up it also reduces the source of odors in the drains. With United 631 you get these benefits in a formulation that is non-toxic, non-caustic, safe on pipes and contains no petroleum distillates or NPEs.