I heated the 4AD solution in a hot water bath for 20 minutes, shook vigorously (many times over two days), and still have white powder at the bottom of the bottle (which I can see with my mini mag). I did not transfer to a clear container to do this, because I felt I would lose solvent to evaporation, although I'm sure it would help for observing the solubility. I just wait for the stuff to settle down and peer into the container w/ a flashlight.
I plan on dropping it into a heat bath again, maybe a few more times.
I am aware that 4AD is the worst for solubility, so I expected 6-7 grams max. But since they advertised it as "safely dissolve 6 grams of any PH" I was disappointed that it didn't dissolve @ 6 grams.
I have another 4 ounce bottle I will use w/ 1-Test-->agreed most reports say 9-10 grams, so the 2 ounce bottles should hold 4-5 of 1-Test no problem, Bennett.
BTW, Longdog, how many ml per pump w/ the old bottles? Is it 1.75? BSL has a lot of mixed up info on their site right now.