Deionized or Destilated water to flash my WC loop

Deionized is good for cleaning the loop, distilled is what you should use inside the loop for cooling, along with a silver coil or PTNuke or both.
 
If I was flushing a loop to make sure that all dust/flux was out of the all the blocks and rads I would simply pump a bucket full of tap water through it and let the water go down the sink. I.e. leave it pumping tap water through constinuously, topping up the bucket if necessary. This will get all the crap out. After that drain it and then do the same with a small volume of deionised as this will flush out any tap water in the loop. You'll save the hassle if getting a large volume of deionised and save some cash.
 
There are lots of opinions regarding this, but my main concern with de-ionized or non-conductive water is, although it is a poor electrical conductor, and therefore will not cause much damage if a leak occurs, water is an excellent solvent, and so if de-ionized water is put into a water cooling system, it will corrode the water blocks to get its ions back.
 
They will both be fine. If your in the UK its a nightmare finding distilled water & at a decent price. Just flush it with deionised that u can buy 5l from halfords for like £3.
 
They will both be fine. If your in the UK its a nightmare finding distilled water & at a decent price. Just flush it with deionised that u can buy 5l from halfords for like £3.

I agree it's a nightmare but if you find some it's about £1 per litre and you don't run as much of the risk of it corroding blocks and rads
 
The primary difference between distilled and de-ionised is that the distilled shouldn't contain any bacteria, but since it will get contaminated as soon as you open the bottle and put it in your loop you still need to use some form of bacterial control (PT nuke + silver coil being flavour of the month and certainly working fine for me after about 6months).

De-ionising removes mineral ions from the water, something that distillation also does. It doesn't make it suck out ions from the metal in your loop any more than distilled water does.

It is good practise to flush your loop out, as delrin flakes and shavings, weld flux from solder and general dirt etc can clog up your waterblocks (particularly impingement type blocks) and pump.
 
I agree, that there is very little difference theoretically between deionised and distilled, I used to use deionised but managed to get some distilled relatively cheaply, and lets face it we only need a couple of litres for loops.

Either with a silver coil and some PTNuke is better than dyed fluids, and although I've used them in the past, after cleaning out some gunk its changed me.
 
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