Coolant issue

It's likely that a full clean is needed to ensure nothing is growing or building up inside the blocks where you can't see. That said, what coolant is it?

I had some Alphacool Cape Kelvin Catcher fluid that turned slightly blue within days, and slowly went more blue/grey over 3 years until it was a murky colour (but still transparent).

I left it running that long as apparently it was the anti-corrosives reacting to pH conditions. Temps never changed, blocks were almost as clean as new after 3 years.
 
I believe the cooling is https://www.overclockers.co.uk/mayhems-x1-clear-premixed-watercooling-fluid-1l-wc-035-mh.html

Temps are fine and there are no leaks I can find. It has been hot were I live for the last week or so. The colour is a very slight green, can only be seen in direct sunlight. Issue was found when I was cleaning the rad and removing dust. I do it every month.

The coolant is premixed with anti-corrosives so there "should" hopefully be no corrosion in the loop. Temps for the cpu are with normal ranges.

Reseached it. It could be the coolant. It can be flux from the rad. I have change the coolant two or three times.

Photo here.
https://www.reddit.com/r/watercooling/comments/eb2alg/green_tint_in_clear_coolant/

This is the same but far worst. With mine its very hard to photo because the green is very slight.

So cleaning my loop. Got new fluid, new tubes and a cleaning kit.

Stock Code WC-113-MH
Stock Code WC-103-MH
Stock Code WC-035-MH

Got the coolant OCUK customer service recommented to me, was going to get EK coolant.
 
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Used Mayhems since forever until 2 or 2 months ago/
Never had any issue, just with their solid white which cost me 2 or 3 days to clean everything.
As I was tempted by a solid white colour, went with EK this time and I'm very happy with it.
The Mayhems looks more like an oil, or at least was my perception when cleaning some spills.
The EK is more like water. Wipe and is fine.
Even the blocks looks residue free when taking apart (had to replace a led strip).
 
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