Hey BP!

Quick tip on older plumbing.  If your home was built before 1980, it is possible you have cast iron drain lines.  If so, these can corrode overtime, especially if you are using the wrong drain cleaner.  Be sure to never use a pipe cleaner that contains sulfuric acid or other chemicals.  These chemicals will cause corrosion to your cast iron lines and eventual leaks.

Instead, try using a drain cleaner that uses lipase enzymes to break down the clog instead of chemicals.  I've used the Green Gobbler in the past, and seems to work great!  

Thanks for reading.