I'll take a pic tomorrow.

But pretty much I drained all coolant, kept a constant flush until clear with no engine running, flush with engine running and heater matrix hot, then waited till clear, fully drained again and refilled with 50/50 mix of coolant and deiionized water.

I would say I got over 8 litres in, closer to 9 most likely as I only have a tiny amount of booth coolant and water. The green is very light in comparison to the extremely dark green of the previous coolant, it was almost like it was running pure as its consistency was so thick.