Goldfish GH Conditioning Salts 10kg (formerly Goldfish GH Conditioner)Phosphate free. Goldfish GH Conditioning Salts add the essential minerals and trace elements which are insufficient in many town water supplies and rainwater. These salts increase the GH (general hardness) of water, promoting healthy osmosis control for optimum body function and contributing to the good health and longer life of your goldfish. With added potassium. Directions: 1 rounded teaspoon or 8g to 10 litres of water will raise GH by