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.
thank you so much. All the plumbers here want to replace the pipe for almost $5000. It is draining slowly after pouring 3 gallons of vinegar and letting it set over night
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.
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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.
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.
Here is a video that might help - https://www.youtube.com/watch?v=glW3VffZL4g
I this article might help you out! http://www.twinplumbing.com/learning-page/2014/november/how-to-clean-those-old-cast-iron-pipes-/