Liquid cooling system of my workstation massively corroded

Only three months after putting in place the Alphacool liquid cooling system for my dual Opteron workstation, it has already corroded severely.

I don't really understand why, since I only used a readily-packaged set as offered by the vendor, and I only used original anti-corrosion liquid from the same vendor.

Spent multiple hours getting rid of all the crystals in the system, dismantling the CPU coolers, etc.

I hope the vendor replaces some of the parts for free and comes up with a good solution to prevent this in the future. I don't want to give up my silent office anymore. (btw: I didn't tell you about my new managed VLAN-capable fan-less 16port gigE switch, did I?).