Just bought some Mayhem's X1 Clear concentrated coolant. I plan on draining, flushing and scrubbing the blocks and rads.
I went with the X1 since it's 90% Biodegradable, and since I'm on well water and have a septic tank, I didn't want to pollute the very water I drink or kill the septic system.
No dye I saw from mayhems was biodegradable, other than the premixed coolants but they stain like mad according to
this OCN page.
Sucks, I wanted pastel ICE white, so I picked up some 3mm darkside LED's from Dazmode while I picked out the X1.
So? Did you ever tear your loop down? It's been way longer than Mayhem's recommends leaving the pastel in... 9-12 months is the lifespan of that stuff. Yours is going on at least 13 months if you filled up in August.