Flow-Aide is a biodegradable descaler that removes scale, lime and rust. Flow-Aide is a dark amber liquid that is non-corrosive, non-toxic, fully-biodegradable, safe to handle and has zero V.O.C. Certified to NSF/ANSI 60 for use as a cleaner in potable water systems. NSF Registered for use in beverage, pharmaceutical, bottling, poultry, and other food processing plants. USFDA has no jurisdiction over the product, since it does not come in contact with food. The Flow-Aide can also be used for use with Evaporators Boilers, Heat Exchangers Chillers, Ice Machines Condensers, Potable Waterlines Humidifiers, Vacuum Pumps and Tanks. Flow - Aide temperature range: Optimal operating temperatures between 65°F (18°C) and 95°F (35°C).