How do you remove rust from inside a cast iron kitchen drain pipe?

by Pat
  4 answers
  • Ken Erickson Ken Erickson on Mar 07, 2018

    You need to provide more details in your question. Is the rust in the area at the sink or further away? I will make assumption that your house is old and that your area of concern is under the sink. A Drain cleaner may help. However when you remove the rust, you are exposing new metal to the liquids that will start rusting. Rust is actually a protective layer on metal exposed to air and water.

    Most drains built in the past 50+ years are made from some type of plastic. If your cast iron is at the sink, I would replace everything from farthest fitting back to the sink with home store available plastic pipe. It is usually a simple DIY project, but you can describe (have photos available) your problem to the home store expert in the plumbing department for recommendations. Talking to a plumber might solve your problem either by them visiting house or having a conversation at their office.

  • Liz Liz on Mar 07, 2018

    1. If these are original pipes, are they up to code?

    2. If you have hard water, the problem will continue.

    3. Do you have a water softener? Imagine your body is also processing this hard water.

    4. the Rust is also in your water heater. And building up on the coils inside.

  • Chas' Crazy Creations Chas' Crazy Creations on Mar 07, 2018

    Here is a video that might help -

    • See 2 previous
    • Laura Wands Laura Wands on Mar 08, 2018

      If it’s draining slowly after using vinegar, you may want to try using vinegar & baking soda together. I use this monthly to keep everything draining well. My Grandmother did this & they never had any plumbing problems.

      We don’t have city water. Our water is very hard. (I won’t drink water straight from the tap, although it’s been tested & is fine).

      I would only put chemicals down our drains if absolutely necessary. So far , for almost 20 years, the vinegar & baking soda has worked great. I use a plastic bag to cover the drain after I put the vinegar & baking soda in the drain, then cover the bag with the strainer & leave it for 1/2 hour, then rinse with very hot water.