Water optimiser from biOrb, use weekly to keep your aquarium crystal clear. Designed specifically for your biOrb use optimiser to improve filtration, remove purities and benefit the well being of your fish. Can be used for all aquariums, is easy to use which means you cannot over dose the water. Use weekly, the ingredients will make the water cloudy when working for a short period Suitable for all biOrbs Dosage: Shake well before use. Two pumps treats 15 litres. Four pumps treats 30 litres. Eight pumps treats 60 litres.