Originally Posted By: sprite1741
Originally Posted By: Kruse
Originally Posted By: jongies3
Am I the only one that wants to know what's up with that string tied around the media?
Most of your older Purolators had a "hernia truss" knotted string around the media. I guess it helped keep everything together during manufacturing.
Could be to keep everything together during use. Not sure I have seen a stringed Puro with a torn pleat.
That's because when they used the string, that was way back when Purolator filters were built with better media and pleat spacing and didn't have a tearing problem. The stopped using the string a long time ago, and there weren't any issues with tearing. It seems that after Mann+Hummel took ownership, something changed in materials and/or manufacturing that caused issues.