Tetra easy balance 500ml reduces frequent water changes and keeps aquarium water fresh for up to 6 months whilst stabilising ph and kh and reducing phosphater your fish and plants will benefit from healthier water and fewer stressful water changes and you will too replicates the action of a water change and adds additional elements not present in tap water promotes the health and condition of fish and plants helps to control algae and actively reduces nitrate and phosphate levels resulting