For the last couple of years we have been buying from Scott Laboratory
I never made any money doing this; it was simply a necessary for the winemakers at which I got grapes for here. I will soon place orders with the outfit again and are willing to help anyone else IF I CAN. Believe me I have felt very vary weighting up any white powder and sending this along to wherever. But it might help us, as anyone else since the quantities are too much for individual winemakers to handle.
SG Brix