Heckler
Active member
I remember reading somewhere that they work to a certain percentage. Certainly the rule doesn't require you to eradicate every conceivable trace of red, but they require you to have no more than, say, 5-10% concentration in your tank - but don't take this verbatim as I don't have the correct number to hand.
If you are going to make definitive statements then you need to quote your source.
Stu