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 infections of the hooves mainly used for cattle and sheep. Copper Sulpharte 25kg Blue Stone Crystals For Use in Footbaths A Standard Dilution Rate of 0.5 -1kg/10 Litres. Also can be used to kill moss on house roofs/kill tree stumps to cause the roots to die. Welcome to Johnston Supplies. Serving the local farming community for over 15 years. We are a family run business and believe in offering quality products for the best price possible. We stock a wide range of Agriculture, Poultry and Equestrian goods. Thank you for shopping with us!