I used soap for a while back in my first rig when all this watercooling stuff was new.
It did nothing for temperatures (though temp monitoring was even worse 4-5 years ago).
It did nothing to stop corrosion, but it did not cause it to happen.
Breaking surface tension too much in the water can harm your pump. There are no bearings between the impeller and the shaft it rotates on, the impeller rides on a combination of magnetic flux and a film of water.
If you have any air at all in your system when you add it, count on 3 days or so of running to finally get all the bubbles out. Pumping foam might overheat your pump, and will not cool your cpu, so don't power up the motherboard when bleeding!!!
That said, all my stuff survived just fine, and my pump works to this day. I wouldn't recommend using much though.
And Welcome to the Forums!
