WTF is this?

[Eflinspy]

I was doing regular maintenance on my custom water cooling loop and I found this white deposit growing in my pipes and GPU water block. I have only ever used distilled water with 25% ethondiole. 
 

[coderrquitsreality]

Ew. Oh. My. God. That is the CRUSTIEST loop I have EVER seen! To me that looks either like residue buildup or calcium buildup. I don't have a loop, so I'm not an expert

[TheBean]

you sure that was distilled water? looks like calcium build up

[Eflinspy]

3 minutes ago, The_Vaccine said:

you sure that was distilled water? looks like calcium build up

I am pretty sure it was only distilled water

[The Blackhat]

12 minutes ago, TheCoder2019 said:

Ew. Oh. My. God. That is the CRUSTIEST loop I have EVER seen! To me that looks either like residue buildup or calcium buildup. I don't have a loop, so I'm not an expert

If you have never used a custom loop, why do you feel the need to provide uninformed commentary on a topic you have no experience with?

[The Blackhat]

15 minutes ago, Eflinspy said:

I am pretty sure it was only distilled water

You would be sure. Distilled water comes from store bought bottles. Did you buy the water in a store that was labelled clearly as distilled or did you use tap water?

Kinda concerning if you don’t even know what water you’re using, that’s a separate issue.

[For Science!]

dried polymerized ethylene glycol.

This has nothing to do with distilled vs tap water.

[Eflinspy]

21 minutes ago, For Science! said:

dried polymerized ethylene glycol.

This has nothing to do with distilled vs tap water.

Do I need to do anything about it. If so how do I get rid of it. Thanks a lot, I was going to go buy citric acid to get rid of calcium saved me. 

[freeagent]

You could try this stuff. I have not WC anything either, I shouldn't comment but I've heard it mentioned in the past..

 

CLR® Calcium, Lime, & Rust Remover | Eliminate Hard Water & Stain Build-up (clrbrands.com)

[For Science!]

6 hours ago, Eflinspy said:

Do I need to do anything about it. If so how do I get rid of it. Thanks a lot, I was going to go buy citric acid to get rid of calcium saved me. 

just rinse it out, no way you dont use acid for nickel plated blocks.