The Vitrified Clay Pipes (VCP) are primarily used in sewer systems due to their excellent resistance to corrosion and abrasion. Made from clay that's been fired to a glass-like state, these pipes are durable and suited for transporting wastewater. They're often found in municipal sewer projects and can be ideal for areas with highly corrosive soil or where long-term durability is required. Their use in modern plumbing has decreased with the advent of more flexible and lighter materials, but they remain a reliable choice for certain underground drainage applications. Best tool for cleaning Vitrified Clay Pipes (VCP): Cleaning the VCP pipes requires careful working as using chain knockers might crack the pipe when the chain is repeatedly slammed into the pipe wall. Carefully inspect the condition of the pipe and make sure to test your solution of choice in an easy location to verify the suitability of the cleaning method. We recommend using any Circular Chain. If the scale build is minimal we recommend going with the Gentle Duty Brushes to avoid any kind of damage to the pipe. if the Gentle Duty is not enough you should try Circular Chains. If the pipe is not stragiht and you got some tight bends to navigate, the Circular Chains might not be flexible enough to navigate through. In these Cases you should go with regular multi-chained Medium Duty Chain Knockers or Heavy Duty Chain Knockers. We always recommend proceeding with caution as if the pipe's condition is badly deteriorated, you might end up cracking or otherwise damaging the pipe when cleaning it.