Copper Sulfate for Sewer Line Roots: Procedure and Schedule

Procedure

1. Use medium blue crystals (not solution).
2. Flush 1/2 cup (118 ml) down toilet.
3. Repeat until 2 lb container empty.
4. Flush several more times to push crystals into line.
5. Vacate house for hours (fumes).

Schedule

Repeat every 3–4 months preventively, or when flow slows. Works in days to weeks.