What to know
Scale can narrow an older cast-iron drain from the inside.
Mineral deposits and corrosion scale can leave a rough interior surface and reduce usable space inside older cast-iron drainage lines. Debris may catch on that buildup and contribute to recurring restrictions.
Camera inspection can show visible scale and pipe condition before descaling is selected. Descaling removes appropriate interior buildup; it does not replace a major repair when the pipe itself is structurally deteriorated.
Key takeaways
- What descaling is intended to remove
- How scale can restrict flow and catch passing debris
- The difference between cleaning a line and performing a major pipe repair
What to pay attention to
- Recurring restrictions in cast iron
- Visible scale on camera footage
- Reduced usable pipe diameter
- Debris repeatedly catching in the same area