There is a very important difference between the Zinc and Multi-Purpose Dispensers: The flow rate. The dispensers are specifically designed to meter the contents at the correct rates, which fit the drinking pattern of the animals.
If Zinc was put into a Multi-Purpose Dispenser on its own it will dispense too quickly and overdose the livestock.
With Zinc especially, the toxic dose and the correct dose are very close together in levels.
That is why PETA developed the separate Zinc Dispenser, which has the correct flow rate for dispensing zinc at correct levels for the control of facial eczema. For more information about the differences between PETA’s different types of dispensers click here.