Brj :
I got new GPU and CPU blocks EK, out of the box, and am preparing them for fresh new installation. I read that i should clean them before use, and i have seen some videos over you tube, dissembling the blocks (removing the top, bringing the block into two pieces) and cleaning/flushing it from inside, so my question is, do i need to do the same thing for the new blocks, or just bring it out of the box, push some water through the input, and that is enough.
I always flush a new radiator but never a new CPU or GPU water block!
I don't know of anyone that actually does that!
After a CPU or GPU has some service life of time and you're cleaning and flushing your system then you should disassemble and inspect and clean if cleaning is necessary, but not to put a brand new water block into service.
Unless it is a brand new water block like the EK Supremacy EVO that is either an Intel or AMD jet plate setup with the flow concentrator and jet plate, that may need to have the flow concentrator and jet plate swapped out for Intel or AMD.
They usually come preset for Intel CPUs (If not the information with the water block will tell you so!), so in the Intel CPU situation there's no need to even open the block at all, but even then, you don't have to clean it, it is already ready to go as far as that is concerned.
The old Danger Den water blocks used to sport a sticker, that if you disassembled the water block you lost your warranty. (Which IMO was totally absurd! As after time of operation you need to clean the water block and you shouldn't loose your warranty cleaning a water block!)
Most of us do use vinegar as a cleaning agent on copper water blocks, but not on nickel plated anything!
I run 100% pure steam distilled water with no additives except a little citric acid, and I've been running close to 4 years with no corrosion on any blocks but my system is all copper.
You definitely need to flush a radiator before putting it into service I usually take mine outside and run water through it using home water pressure, reversing the flow through the radiator to dislodge any possible manufacturing process contaminants left behind.
You've been getting some information in this thread that is absolutely not accurate, never use isopropyl alcohol inside a water block, you can use iso alcohol to clean off TIM outside the water block but not inside the block!
You're much better off to use what the water block manufacturer recommends!
Never use automotive type coolants like inhibited glycol with an acrylic faced water block, it will cause the acrylic on the water block and your reservoir to crack and fail!