General Purpose Water Soluble Low Foaming Metalworking Fluid is compatible with hard and soft water in a range of up to 1000 PPM. The Metalworking Fluid offers ferrous corrosion protection and ensures excellent machine cleanliness. The Metalworking Fluid is a low foaming type formulation that rejects tramp oil. General Purpose Water Soluble Low Foaming Metalworking Fluid is safe to use and suitable for a wide range of materials.