We want you to flush with confidence when using Charmin, and to ensure that our TP performs to our high standards, we use several methods of testing. These test include the Bowl and Drain-line Testing, Settleability Testing, Disintegration Testing and<br />Consumer Testing. In addition to these technical laboratory tests, we do extensive testing with consumers under real world conditions before we introduce a product. These tests also probe the consumer&#39;s experience with flushing the product. Our tests indicate you shouldn&#39;t encounter plumbing problems when using Charmin appropriately in a properly functioning and maintained system. We&#39;re very sorry to hear otherwise, and welcome you to call us at 1-800-777-1410 Monday-Friday from 9am-6pm EST, so we may learn more, and see how we may help.