Raw water system cleaner

[Youghster]

I'm thinking to clean the heat exchangers on my 5.7 Crusaders. I saw a utube video that featured "Barnacle Buster" and, if it works, I'm game to give it a try. Do any of you skippers have experience with this or a similar kind of suck it up and soak it product ?

[Fishsail]

I tee off the main intake strainer with another valve as a flush point and an emergency bilge pump. I run a diluted solution of Mariatic acid and fresh water, (about 20 % acid) thru the cooling system , let it sit for 15 min. And run engines normal to flush out the acid. All kinds of junk comes out. I do this about once a year. Eng. temp’s usually drop 10 deg. Caution! Don’t use too much acid or let it sit too long. It can eat up the solder on the cooling bundles.

[Youghster]

Thanks for the tip. We used muriatic acid in cooling systems of continuous miners underground so that was my first thought. Then I saw a product designed for the job and wondered ? 80 / 20 for 15 minutes Thanks again