Price is per kg.
Copper Sulphate is interesting - more info here https://en.wikipedia.org/wiki/Copper(II)_sulfate
Often used in agriculture is has anti-parasitic and anti-fungal properties.While 'natural' care must still be taken when administering.
Useful for internal worm control plus for addressing copper deficiency.
Our Olssons trace element blocks have added copper and are a controlled method of making copper available to your livestock. Available in store.