"Andy Hall" aka wrote in message
...
On 21 Mar 2006 04:28:02 -0800, "
wrote:

I assumed they worked because my plumber installed a magnetic one
inline to the new boiler I brought. I thought it was the same
principle. Are you guys all saying that these don't work either ?

Completely useless.

Matt, what experience of these do youhave, besides guessing?