it's messy if you're so inclined to slosh the heck out of it when making up a slurry, 99% of people are capable of doing it with minimal to no mess at all and if you test your system, find the proper dose and then add that much it's no different then any other additive/supplement you add to the system 99% of people are talented enough to do that as well, i guess your supplier is that 1%
