The special mixture is a specially formed bacterial consortium designed to create a stable biological system in freshwater and saltwater aquariums. It breaks down organic waste so that the water is cleaner and cleaner with reduced odors. Improves growth and nutrient uptake in plants and corals. Safe for fresh and salt water tanks. Special Blend is natural and contains cultures of live bacteria for a balanced aquarium. It biologically reduces nitrates, dissolves excess proteins and helps reduce ammonia and nitrates.