Has anyone purchased this dosing pump system? I was wondering what the reviews on it were like. Should I get one of these or can I use an Aqua Lifter on a timer? The only thing that worries me about the Aqua Lifter is that it pumps the liquid through the tube pretty fast and if I'm going to use it for a two-part system it'll need to be much slower. The Aqua Lifter pumps 3.5 gallons per hour (220 mL per 1 min.). Any suggestions?