Corrosion of Water Block

I was recently testing my w/c rig before putting it in my computer. I ran it for a day using distilled water, and the next thing I knew was that the water had turned a milky white, with a coat on my tubes. I decided the best way to be rid of this was to flush the system and run it for a while with a mixture of water and bleach. I went to work after setting it up, and when I came back seven hours later, the water had turned brown! This is not such a big deal, but when I looked at the water block, a Danger Den Maze 4, the maze part of the block was a corroded green copper color. What can I do? Is the block ruined? How can I flush this brown residue out? Any answers would be greatly appreciated.

Thanks

You should flush with "CLR". As for your problem, it could have been from your lines having a coating on them.

Are you sure bleach is recommended for this kind of operation?