[MrBuffet]

Thanks again for the feedback -- much appriciated.

Not that I want to get into too much technicality here (ok -- I do!), how does sonic testing go to assure there is not rust/scale in the system? I get the pressure testing part, as that will show any rust penetration from the water cooling system to the outside (even minute stuff), but what does the added sonic test buy me?

Thanks,

Peter