How to mix rock salt for a sewer line

Updated April 17, 2017

If you have trees growing close to your sewer lines, chances are you have tree roots clogging up the drain. You can clear out the roots with the mineral form of sodium chloride, rock salt. Calling a plumber to clean out the line is expensive. Chemicals can harm your pipes, leading to more problems. Rock salt is a safe alternative to cleaning out the sewer line, and is easy to mix on your own.

Pour one box of rock salt into the toilet bowl.

Flush the rock salt down the drain. Do not use the drains for at least eight hours after doing this.

Repeat this process once a month.

Pour 9.07 to 11.3 Kilogram of rock salt into a laundry tub or bath tub. Close the drain.

Turn on the hot water tap and mix the salt and water together with a stick, broom or long-handled spoon.

Drain the salt water from the tub. Do this at night or when the house will be empty for most of the day. Do not use the drains for at least eight hours. The rock salt needs to stay in the line to kill the tree roots. You can use the drains the next morning.


To avoid burns, do not mix rock salt and hot water by hand.

Things You'll Need

  • Hot water
  • Long-handled spoon, stick or broom
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About the Author

Gail Delaney is a writer in South Dakota and has articles published online at various websites. She is the garden editor for BellaOnline, with years of gardening experience. Being the caretaker of her parents led her in the direction of medical issues, especially natural remedies.