Melpat Red Copper is a 500g active cuprous oxide - as apposed to it's competitor at 750g active.
We selected the 500g ai formulation for two reasons - the first being the issue of crop safety. We believe that less concentrated forms of copper are less risky to more sensitive plant tissue.
The second reason is - we are very happy with our 500g ai formulations, and as the saying goes: "if it ain't broke, why fix it?"
In line with all copper-based products, the particle sizing is optimised between 1 and 2 microns, providing the best fungicidal value.