What's this white looking powder in my WC loop?

Soldato
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I'm using a t-piece instead of a res:
imgp1542yn8.jpg


Now, on the horizontal tube (by the copper wire) I seem to have white powdery deposits.... I haven't a clue what they are, are they anything to worry about? :confused:

Close up:
imgp1537hw6.jpg
 
can't see it too well...it could be dislodged limescale?
I'll grab another photo outside, hopefully it should come out better... Give me a min....
What blocks/metals are you using?
The only block is a D-tek Fusion, along with a PA120.3 and a swifttech pump. So I'm guessing all copper. I've added some coolant also, only around 10ml or so.
How old is the tubing?
The tubing is all new, and I did flush it all thru first, but I got the rad 2nd hand, I think it's been used before, so I guess the white stuff could've been in the rad maybe?
 
A white build-up inside the tubes is pretty normal, but usually takes a while to start showing up.

What kind of coolant and water are you using?
 
I managed to get a better shot while outside, click on it for high res version.

It's at a bit of an angle but you can see the bubbles which are at the top of the tube and the white stuff of the bottom.
A white build-up inside the tubes is pretty normal, but usually takes a while to start showing up.

What kind of coolant and water are you using?
It's the same stuff as I use in my car, it says "halfords Advanced Protection Anti-Freeze & Summer Coolant" on the bottle. It says it has corrosion inhibitor in it... (this shouldn't be a competitor, they're mentioned enough over in Motors :D )

One thing I forgot to mention, I've used this Fusion before as a part of another loop, so I'm guessing the white sediment could've come from the block? I did my best to flush all the parts out before adding the tubing, but I guess some of it might not have got flushed out?

Anyway, I'm guessing it's not really much to worry about? My temps are good and my rad fans aren't at warp speed 9, so would it be best to to check it doesn't get any worse?
 
did you flush out your pa rad?

i had some white stuff (not nearly as much as you though) which i flushed out with water running for a while
 
Yep I flushed everything out. Probably not well enough tho. :( Also, when I first had the tubing connected, I filled it with water, let it run, then drained it and refilled it again with water + coolant.

As a lot of the white stuff has gone into the t-piece, I could drain just the water in the T-piece, remove the white stuff while trying not to get air into the rest of the loop?
 
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