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Need help diagnosing buildup in gpu blocks

post #1 of 17
Thread Starter 
So my build has been running smooth since the tail end of 2013 when I threw it together. I've noticed this weird buildup in my GPU blocks. (I'll be honest I haven't been super attentive to the blocks so I'm not sure when in the last 9~months this started; I've mostly just watched temps over time.) I'm wondering if it's plasticizer leeching from the tubing over time or some sort of algae growth.




My tubing is cloudy but it's close to three years old I had figured that was fairly common, maybe not? It looks like it's just above the gpu dies, so maybe it's heat related?
I've already ordered new tubing and plan on scrubbing my blocks and flushing everything, but what can I do in the future to prevent this? Currently running distilled + PT Nuke for coolant.
Any help would be much appreciated!
post #2 of 17
hi there
are you using mixed components for the loop? brass?nickel coated? silver?

thats either nastys growing or oxidation due to having mixed metals.....

best would be to start tearing the setup apart/the loop etc and start cleaning...
post #3 of 17
Plasticizer from your tubing. You can tell because it's basically happening where the particles are easily trapped (corners and microchannels. Same thing happened to me when I was using XSPC tubing.
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post #4 of 17
that stuff looks to be a little green. have you ever noticed the nickel flaking off?
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post #5 of 17
Thread Starter 
Quote:
Originally Posted by X-PREDATOR View Post

hi there
are you using mixed components for the loop? brass?nickel coated? silver?

thats either nastys growing or oxidation due to having mixed metals.....

best would be to start tearing the setup apart/the loop etc and start cleaning...

I do have copper in the radiators and nickel in all my blocks. How long does it take distilled water to start becoming ionized in a loop? Is 9months maybe too long to go for a flush?
Quote:
Originally Posted by battlenut View Post

that stuff looks to be a little green. have you ever noticed the nickel flaking off?

I am a little colorblind, so I wasn't quite sure of the color to be honest. Just started draining, but from the angles available I have not noticed any flaking. I'll update after I tear open the blocks.
Quote:
Originally Posted by Fickle Pickle View Post

Plasticizer from your tubing. You can tell because it's basically happening where the particles are easily trapped (corners and microchannels. Same thing happened to me when I was using XSPC tubing.

I was also using XSPC tubing, so I think this is very likely the culprit. Switching to some Primoflex LRT stuff so hopefully that helps.

Thanks guys!
post #6 of 17
Thread Starter 
It looks like all of the theories were correct unfortunately! As soon as I pulled the gpus out of the mobo I was able to get a better look at the damage.



(post quick-scrub of the plasticizer, this is what's left in/on the channels)


I guess I made a battery in my loop doh.gif lesson learned.

What would be the best way to clean this off? So far I've just been using a toothbrush and warm water and it doesn't seem to be very effective.

Edit: found some old threads recommending non abrasive metal polish, worked like a charm!
Edited by Floogy - 9/3/16 at 1:01am
post #7 of 17
straight up soak those blocks in lemon juice mixed 50/50 with vinegar....for at least 24h.....that will kill all germs also floating around
post #8 of 17
Thread Starter 
Quote:
Originally Posted by X-PREDATOR View Post

straight up soak those blocks in lemon juice mixed 50/50 with vinegar....for at least 24h.....that will kill all germs also floating around

I've read that acids can damage the nickel?
Quote:
When cleaning nickel plated copper, it is forbidden to use any aggressive chemicals (or vinegar) or rough materials as you may damage the plating and thus void the warranty.

That's straight from EK here, but is that more just a warranty thing?
post #9 of 17
not sure if this will help, but you could try starsan or one step. they are sterilizing solutions for brewing but they clean like peroxide.
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post #10 of 17
Thread Starter 
After cleaning the easy goop out of the water channels it looks like what's left is actually flaking rather than an algae.




Is there anything I can do for this or just seal them back up?
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