Ive been suggested that i add calcium to my next batch via gypsum or AKA calcium sulfate dihydrate (aparently my water is low in calcium). Im guessing the fertiliser versionof gypsum is different to the HBS.... Going to Woolies is way easier, does powdered milk work ??? since its long life ?
And do you really need to add a Multi-V/VEGEMITE to a TPW ?
I know dumb idea's .... but i gotta ask ...curiosity