Bron:
http://www.xtremesystems.org/forums/showthread.php?t=54331
1. Cleaning of radiator and waterblocks.
2. Cleaning the funnel.
3. Filtration
1. Cleaning the Radiator and Waterblocks
During the manufacturing of PC radiators, certain chemicals are used that can leave residues inside of the radiator. Due to the time and cost, it would take to ensure that all of these residues are removed, radiator manufactures do not properly prep their products for use. You can see just how dirty radiators are in the pictures below. The picture is of some vinegar that was in a Black Ice Pro2 for about 6 hours.
Advisory: If copper, brass, or the solders used in radiators are exposed to vinegar (acetic acid) for extended periods of time, the acid will begin to eat away at the materials. I have updated the guide to limit the soaking of components in vinegar for no more than one hour. A tale-tale sign that vinegar is eating your copper components is a blue tinge to the vinegar, which is caused by copper ions being dissolved into the vinegar. If you want to play it completely safe, I suggest substituting the vinegar for isopropyl alcohol, or as recommended to me by Marc of Thermochill, Kamco System Pre-Clean which is specifically designed for cooling systems for use. Finally, salt, when combined with vinegar, acts a catalyst for the destruction of copper (I am unsure if it hastens the reaction with solders or plastics). So please do NOT include salt in any cleaning regimens of your watercooling loop.
Thankfully prepping a radiator for use is a relatively simple procedure. Just follow the steps I have outlined below.
1. Flush the radiator with distilled water. I suggest getting 2-3 2.5gallon jugs and just start pouring about 2.5-3gallons of distilled through the rad.
2. Pour Distilled or De-Ionized water into radiator. - Pour until full, drain and repeat. Shaking the radiator when it is half full of water will help. Repeat this 3-5 times.
3. Following the same procedure as in step 2, repeat with vinegar.
4. Fill the radiator with vinegar, and let it sit for appx. 1 hour.
5.Flush the radiator, following the procedure of step 2. Repeat Step 3 as well.
6.Repeat Step 4.
7.Repeat Step 2.
Alternatively, or in addition to the above outlined cleaning methods, you can pump hot water through your radiator which will clean out the left over solder flux from the manufacturing process. This method will work well with Thermochill radiators because they use water based flux, but it is not known how well it works with other manufactures radiators.
Flushing the radiator with hot water can be accomplished by filling your sink with hot water (via the tap) and leaving the tap on. Then, using a submersible pump (you can purchase one at a local fish store for cheap), placed in the sink, pump the water through the radiator and into the other side of the sink. If you have a one sided sink, using a bucket in the sink to hold the water will work.
If you are still not satisfied with the cleanliness of the radiator, the final step you can take is to create a small loop with the radiator, pump and reservoir/T-line along with the Pentek 5 micron filter I will mention below, and pump the water through the rad. If done overnight, the water will erode most debris/rosin that has not already been removed and the Pentek filter will ensure that it never gets back into the radiator.
You're now done cleaning the radiator. It may seem like a very tedious and time-consuming procedure, but as you saw, PC radiators are far from clean.
Now that you’re done with the radiator, we can move onto the waterblocks. Thankfully, the waterblocks are much easier to clean than the radiator. The first thing to do is to take the waterblock apart, and flush it with de-ionized or distilled water. After you have flushed all of the parts, grab some vinegar and pour it into a glass or ceramic bowl. Plastics won’t do as they can actually stain the waterblock. Once the bowl has been prepared, place ONLY the copper base of the waterblock in the bowl, making sure it is fully submerged and that only a small portion of it (non-wetted surface) is touching the bowl. Set the baseplate stand in the vinegar for 1 hour. Upon removal of the waterblock, flush it with distilled water and then lightly scrub it with a NEW toothbrush that has been cleaned off with rubbing alcohol and distilled water.