Copper pipes are most commonly used in plumbing for water supply lines and heating system components, including hot and cold water distribution and radiant heating systems. It is preferred for plumbing due to its durability, corrosion resistance, light weight, and ability to handle high temperatures, making them suitable for both residential and commercial use. It is absolutely harder than PVC, PEX, or ABS but softer and more flexible than Cast Iron. Best tool for cleaning & descaling Copper pipes: When it comes to cleaning or descaling copper pipes, Light Duty Chain Knockers or Gentle Duty Brushes are recommended to avoid damaging the pipe's interior. However, for more stubborn descaling needs where these tools might not suffice, Heavy Duty Chain Knockers can be used with caution for great results as well.