Thanks Ken. I'll dive into that.
In the meantime, on further research, I think I should use a descaler instead of Barnacle Buster, which is geared more for removing mineral deposits from salt water and organic life, ie, the raw water system. Trac's Descaler is designed for a "closed loop cooling system".
TRAC's Descaler®, concentrate & premixed, are biodegradable solutions that remove residues caused by freshwater without using any harsh acids.
www.trac-online.com
Trac Ecological Barnacle Buster is a safe and biodegradable marine scale remover formulated to meet an industry need for cleaning seawater-cooled equipment.
www.trac-online.com
This video includes a casual interview with the former owner of the company that developed Barnacle Buster. His comments are more informative than the website. There's a lot of content in the video which is too-cute fluff for my interest. The following sections were the most informative for me.
3:45-7:30 - Intro flush device, BB explained
17:00-18:30 - Device in operation
Barnacle Buster Engine Cooling Therapy