It can definitely be an easy system, the only thing I have found is that they don't last long - if somehow you could concentrate the solution more, I think that would be good. So far the pack would only last a year on a 5 gallon, so only 3 months on a 20g, then if you have multiple tanks, etc. etc. I have found it's also hard to do "half a pump" if you have a more unconventional tank size. Another thing I have thought about is finding pump bottles that I could just use for PPS-Pro - you would get the more precise PPS-Pro dosing, instead of EI, but you wouldn't have to use a syringe.