I got today the swiftech kid and am a bit confused as to how to prepare the liquid. It says in the instructions:Simply empty the concentrated coolant into a 1liter plastic bottle, and complete filling with distilled water. Your coolant is now ready. It goes on to say how much % i should use as a additive. My question is How do i know if what am planning to use its 5% or 10%? With the eye i can't tell much