Tim Carter, a master plumber who writes a nationally syndicated column on building matters, has an interesting faceoff published in The Washington Post.

Carter was challenged by the Responsible Flushable Alliance after writing a column inspired by a letter he received from South Carolina man whose sewage ejection pump was ruined “to the tune of $3,000 by ‘sewer and septic safe’ flushable wipes.”

Carter decided to respond with a video rather than just words so he rigged up his own toilet test.

“It’s important to realize I knew that the Responsible Flushing Alliance would challenge my video findings,” he writes. “I asked for its input on the testing protocol methods so the group couldn’t cry foul. It did provide me with some documents outlining how it tests, but at least one thing in its method does not meet any plumbing code I know of. I ignored that part of the protocol and installed my drainpipe as is called for in the Uniform Plumbing Code.”

You can read the Washington Post story here, his original column here and the letter he received from the alliance here.

Below is his video. SPOILER ALERT: “Finally, if you must use flushable wipes, please don’t flush them,” Cater writes. “Dispose of them in your home as you would a soiled baby diaper.”