Another DIY Tig Torch Cooler Shooting for under $100 not counting my labor

[zoama]

You'll need a corrosion inhibitor. With that mixture of metals (iron,aluminum and copper) you'll have galvanic corrosion.
What coolant did you have in mind ?

[aaxiss]

Well I was Planning on using The defense coolant Concentrated 2-1 mix that arczone sells. I already had thought about the galvanic corrosion Problem and was just going to weld a piece of 1/2" .125 aluminum to the underside of my filler cap that reaches in below coolant level and bolt a small zinc bar to that to serve as a sacrificial anode. I could always do the tank in stainless but I would still need the zinc because the pump housing and impeller are steel and with the brass and copper having greater cathode potential the steel pump would then have the greatest anode potential and corrode. Sound right?

I think I have that covered but my coolant choice is still up in the air. What would Brian Boitano do? LOL

What coolant additive would recommend for the three tank types listed below

Tank 1 Poly type
Tank 2 Stainless steel
Tank 3 Aluminum

Thanks for the heads-up Zoama

Cheers