Use three capsules for new filter material, when reconnecting the filter after winter and after cleaning the filter material. Use two capsules every four weeks for long-term bioactivity in the filter. Open up the capsule and sprinkle the powder directly onto the filter material in the filter. Leave the pump switched off for two hours for maximum effect. We recommend using Tetra Pond AquaSafe at the same time in order to remove harmful substances in tap water such as chlorine and heavy metals.