Aptus - System Clean 1 LitreCLEANING DRIP SYSTEMS System Clean is a powerful oxidizer that prevents microbial attacks, line blockages and nutrient build up in irrigation systems. A clean irrigation system improves growth and development of plants especially in the root system by allowing more oxygen and nutrients to reach the plant without affecting the pH. Unabsorbed nutrients increase biofilm in the irrigation system. These remaining nutrients acidify (lower pH) the medium