The PPMDD Pre-Mix is simply a mix of four natural ingredients and their individually natural granualar sizes ... for over a decade now, there is no grinding or other processing that is done <grin> ...
I personally still use the PMDD Pre-Mix on several low tech tanks on a routine basis and also on most of my high tech tanks immediately following a water change ...
I personally mix 4 Tablespoons into 500 ml of water to create my dosing solution and shake vigorously to mix well ...
I personally prefer to use a Pepsi Big Mouth bottle as a mixing/dosing bottle because it has a nice wide mouth that makes it really easy to slip a measuring spoon directly into the bottle ... no mess ...
Thanks,
Greg