Dear tsuwm, Thank you for the link. Since I am new I did not know about the prior discussion and found the info at the plumbing site very enlightning. I blush to have promulgated a myth. Goes to show that even one as intelligent, enlightened and perfect as I can make mistrakes. I appreciate your sending along information and not just making me feel like I was being rapped on knuckles. If everyone here is as empathetic I have found a happy place that I hope you will let me join .... I promise to mind my manners and think and check before post. Aloha, wow