We are taking a pH buffer solid compound and trying to dilute it so we can include a standard "measuring cup" in the package (i.e. a 1/4 cup). The current compound is too concentrated. The pH buffer compound is used to adjust water for plants, so whatever we use cannot affect the plant. I'm sure there is something that doesn't affect pH, is a solid, water soluble, and doesn't affect plant life.
Salts are not good for plant life, so that's out. Maybe inert is not the correct term. It's something that can be added to the dry particulate that will reduce the concentration and will not harm plant life.
