"This would lead me to believe that dry chemicals are measured in weight ounces, and liquid chemicals in liquid ounces. "
That gets back to the original question. When the reommedation is to add a Tbsq00n of something; what are we to interpret? A thingy of dry added to water? That is sort of what I am doing. But to be precise I was wondering if it meant that the chemical when dissolved into the form which is introduced into the tub. In this case I use a quart jar and eyeball, mine is calibrated of course, a few thingys into it and shake it up and pour into tub with jets on.
Been a long time since Chem 101. What does it mean something is added to buffer something? Language skills are elusive this morning?