Have a look at Component B in 2L form - you can dose that.
My guess is its just Micro E to 2L R/O but its just a guess
Same like NP Pro in 2L form is 50ml NP Pro to 2L R/O
http://www.reefcentral.com/forums/showthread.php?t=2570237
The bottle your using might be better to use as the iron in a dosing container of Comp B tends to settle onto the bottom.
Least with a bottle & dropping you can shake before you dose.