When cooling water, temperature, steam, and condensate fully rule out all copper materials, the supplied Copper Nickel 90-10 Tube is preferred. Our tube provides excellent protection against erosion and impingement in ocean water flowing at rates of more than 3-3.5 m/s due to the hardness and oxide type whereby the surface is auto-secured. Our Copper Nickel 90-10 Tube is very resistant to cracking and stress corrosion. Unfortunately, it is equally vulnerable to water-based assaults. As a result, consumers are not advised to use this tube in standing or slow-moving water.