Heat Exchanger Cleaning on Seakeeper Gyro

[Swimmer]

My QSB coolers go to a radiator shop for pressure testing and cleaning, so I had always wondered how my heat exchanger for the Seakeeper Gyro heat exchanger was doing. I ended up buying a second heat exchanger that I put on, and will swap it out with the original every few years.

Overall, the tubes looked good, no blockage. I am going to cut new end cap gaskets and clean this one up. So my question, what would you suggest to clean the internals of the raw water tube bundle?  

-I was thinking of CLR? 

-CLR dilution?

-How long should the solution stay inside?

Any other ideas welcome.

Photo of the new Ht Exch shown.

BTW, I realize I could have pulled the end caps and checked it, but there are other reasons why I bought a new one and they are not very $, well in boating terms that is.

Topic

[Tony Athens]

Commonly available Pool acid (HCL)  mixed 10:1 with water is what we have using for over 3 decades..Ttotally safe, easy to get, cheap,  and 100% safe

[Author]

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