I did not want to pull my water pump impeller to run Barnacle Buster through the engine. So I used my Sea Flush tool that I use for winterizing my engines. Used it to suck the BB into the engine and let it sit for the recommended time, maybe 6 or 7 hours, and then started the engines to flush the BB out. After when I ran the engines one dropped 5 degrees and the other engine dropped 10 degrees. Very simple process, took about 5 minutes per engine to put the BB in and then just run the engines.
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.