(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 6 of 6

Thread: Using CLR to remove buildup from cast iron drain pipes???

  1. #1

    Default Using CLR to remove buildup from cast iron drain pipes???

    A few months ago, I had cut out my bathtub trap and replaced it with a tubular plastic one. The old one was cast iron, and about 50% blocked with a rusty-buildup on the bottomside of the pipe. I was wondering if anyone has tried using CLR to fix a slow cast iron drain, thinking that it might be able to remove the rusty buildup inside (house is 55 years old)?

    I e-mailed Jelmar and they had this to say:

    "CLR, Calcium, Lime and Rust is safe for use in copper plumbing and septic systems and does remove rust so pouring it down your drains could help if the cause of the slow drains was in fact a rust buildup. The effectiveness of CLR comes with contact. Iím not sure if pouring it down your drains would have the 2 minutes of contact that usually takes to remove a buildup."

    Thanks.

  2. #2
    In the Trades Tom Sawyer's Avatar
    Join Date
    Nov 2010
    Location
    Maine
    Posts
    2,946

    Default

    I suppose it might work but in many cases, once the rust goes it leaves a hole behind.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,448

    Default

    If there's that much rust, the integrity of the pipe and fittings is in question...I think it's time for more mechanical work (remove and replace) rather than chemical.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #4
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,687

    Default

    IF CLR would work, which is not a given and also probably not likely, it could take YEARS to dissolve the buildup, NOT minutes.
    Licensed residential and commercial plumber

  5. #5

    Default

    This was the pic when I cut out the old pipe. I would imagine the rest of the pipes in the house look similar. Pipe integrity seems OK. Does this look like rust build-up? The gunk has sort-of the same texture as "astronaut ice cream" - dry and crumbly.

    Name:  DSCF0043.jpg
Views: 2816
Size:  55.2 KB

  6. #6
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,687

    Default

    If it come loose, it was not rust. If you have to use a hammer and chisel, then it IS rust.
    Licensed residential and commercial plumber

Similar Threads

  1. Remove Iron from pipes
    By waterworld in forum Water Softener Forum, problems, installation and reviews
    Replies: 3
    Last Post: 04-23-2010, 10:01 PM
  2. how to remove a cast iron tub
    By tileman2000 in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 34
    Last Post: 01-14-2010, 08:37 AM
  3. Replace cast iron drain pipes.
    By Big John in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 5
    Last Post: 12-27-2009, 06:24 AM
  4. How to temporily remove cast iron radiators?
    By jch in forum HVAC Heating & Cooling
    Replies: 5
    Last Post: 08-27-2007, 06:11 PM
  5. remove cast iron tub
    By tinkerking in forum Shower & bathtub Forum & Blog
    Replies: 2
    Last Post: 06-27-2006, 12:30 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •