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Dark brown goop building up on walls of reservoir - is it the kill coil?

post #1 of 35
Thread Starter 
There is a dark brown substance forming just above the waterline on the walls of my reservoir.

I'm using distilled water with a silver kill coil (no special coolants or additives). From what I've read, this is a solid option. There were a few reports of the silver reacting with other metals in the loop but it sounded like for the most part, this issue was linked to one particular vendor that has since fixed the problem.

Anyway, I'm using the following components in the loop:
-Alphacool NexXxoS XT45 Full Copper radiators (2x quad, 1x dual 120mm)
-EK Supremacy (Acetal+Nickel) CPU block
-EK-FC R9-290X (Acetal+Nickel) GPU blocks

Does anybody know what might be causing this and what I can do to fix the problem? I'm worried that my waterblocks are getting gunked up and it will eventually cause a blockage.

I ordered some new tubing and plan to tear down, thoroughly clean and reassemble the loop this weekend. Does every loop start to get a bit nasty if you don't clean it often enough? It's been about 4 months since I first put the loop together and this will be my first time cleaning it out.

All info is greatly appreciated.

Thanks
post #2 of 35
Sounds like it could be plasticizer.

What kind of tubing are you using?

edit:

Also, if at all possible, pics would be a good addition to this thread.
Edited by Unicr0nhunter - 4/9/14 at 10:04pm
post #3 of 35
I would guess, without pix, that it's either plastisizer, corroded silver, or algea.
Most likely plasticizer as Unicr already guessed.

I recommend you get rid of silver and get X1 instead, for both corrosion and algea.

And get Primochil Advanced LRT
.....or change your tubing often.
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post #4 of 35
Thread Starter 
Thanks guys, I really appreciate the help.

Anyway, I actually am using PrimoChill Primoflex Advanced LRT tubing. Are there any known bad batches though? The tubing has a foggy / tinted appearance as opposed to perfectly clear when I first installed it.

Here's a picture of my reservoir:



In addition to the brown stuff on the walls of the res, it looks like there's some white precipitate in the water and on the walls of the tubing.

Thanks again

Edit: One more thing, I did make sure to thoroughly clean out the radiators when I first got them but I didn't rinse out the waterblocks. I'm not sure if this could cause any problems but just figured I'd throw it out there.
Edited by ShoehornHands - 4/10/14 at 12:41pm
post #5 of 35
Yup, that's plasticizer alright.
Certainly not algea.

How old is your tubing?

I got pissed with my plasticizer issues on my last 2 builds.
So I move to copper tubing on this one.
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post #6 of 35
I actually don't think it's plasticizer. Especially not from Advanced LRT tubing. If so that would be the very first time I ever heard of plasticizer issues from that tubing and in only 4 months? That would be unheard of. Perhaps if it turned out to be Primochill Primoflex Pro LRT tubing instead but iirc the plasticizer issues from it was typically a white film. XSPC tubing would leech a brownish plasticizer similar to that but it would be everywhere in the tubing and where the water was, not growing above the water line in a res.

If it's happening to an area of the res that's below the waterline, meaning that there's not a constant flow there, and all you're using for a biocide is a silver kill coil, it very well could be algae. That's the problem with using a silver kill coil instead of a liquid biocide is that it's only effective while/where the water is moving. Any time it's powered off &/or any dead zones where the water isn't moving creates a susceptibility to algae.
post #7 of 35
I have little of that in my res as well, more like a transparent white layer, I have had my res for 1.5 years. It could possibly be plasticizer or what ever its called because some tubes has like a greyis coat inside of them. I use two different manucafturers of hose in my system, dont know which though.
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post #8 of 35
Why I don't think it's algea is because, to me anyways, it looks like it's on the res walls above the water line.
Wouldn't algea grow in the water? Usually near or at the surface?

But yeah, the res getting the most light is the most succeptible to algea.
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post #9 of 35
ewwwwwwy, thats nasty
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post #10 of 35
Thread Starter 
Something I forgot to mention is that the water level in the res goes up about an inch when the pump starts up so the brown gunk starts right at the water level (you can sort of see this in the picture where it's perfectly straight along the bottom of the gunk).

Here is the exact tubing I purchased: http://www.frozencpu.com/products/17587/ex-tub-1575/PrimoChill_PrimoFlex_Advanced_LRT_Tubing_38ID_x_58_OD_-_10ft_Retail_Pack_-_Clear_PFLEXA10-58.html?id=2KyCEFzb&mv_pc=169


The reason I asked about a possible bad batch of tubing is because I vaguely remember reading something about it (before I built the loop, when I was reading everything I could find about water cooling to educate myself). I'm not sure what brand of tubing it was though or heck, maybe I just dreamt it up.

That's a good point you made regarding the limitations of the kill coil Unicr0nhunter. For the reasons you mentioned, I'm thinking it's probably a good idea to add something to the water this time around.

Hopefully somebody can shed some light on this so I can prevent it from happening again. As I'm sure you all know, it's a giant PITA to tear down a loop for cleaning.


Thanks again for all the help.
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