I came across the following thread on another forum talking about using something called the Dosmatic MiniDos 1%, which is an injector that mixes the incoming water with a specific ratio of whatever liquid you want. But the lowest ratio allowed is 1:500, so the author determined the Prime needed to be diluted to 1:80 with RO water first.
http://www.aquatic-forums.com/forums/24 ... t3001.html
http://www.aquatic-forums.com/forums/24 ... t3001.html