Never thought about drops in our muck.., yeah can see how that would be non starter
yeah, is it a lime green or a brownish sorta lime greenish yellow color
I"m sure your supersoil has buffers built into it, so you would probably not have a big variance if you use the same kind of water and your teas pretty consistent. Most tap water in the mid 6's (RO water little lower usually), some well water can be a 8-9 range. My nutes with water (varies on amount of nutes) is usually too low (mid 5's) so I have to bring it up a little bit to a 6.4 range my nutes say works best at in soil (figure they want you to buy their stuff, so I go with what they say works best ).