Shop By Featured Category. Business, Office & Industrial. Clothes, Shoes & Accessories. Home, Furniture & DIY. Welcome to Johnston Supplies: Proudly Serving The Local Farming Community For Over 15 Years. Copper Sulphate x 25 Kg – Horse/Pony Smallholding Animal Care foot bath. 25kg Copper Sulphate Feed Grade. Copper sulphate is used in footbaths to fight …