Water optimiser from biorb use weekly to keep your aquarium crystal clearr designed specifically for your biorb use optimiser to improve filtration remove purities and benefit the well being of your fishr can be used for all aquariums is easy to use which means you cannot over dose the waterr use weekly the ingredients will make the water cloudy when working for a short periodr suitable for all biorbsr dosager r shake well before user two pumps treats 15 litresr four pumps treats 30 li