Easy Balance can replace the refreshing action of a water change. By using Easy Balance, you can reduce the frequency of water changes, to a minimum of once every 6 months. By reducing the number of stressful water changes, and adding essential elements to the aquarium, Easy Balance also helps to maintain improved fish condition. In addition, Easy Balance contains elements for encouraging healthy plant growth, and it actively reduces nitrate and phosphates, thus helping to control algae. Product Features : Easy Balance can replace the refreshing action of a water change. By using Easy Balance, you can reduce the frequency of water changes, to a minimum of once every 6 months. By reducing the number of stressful water changes, and adding essential elements to the aquarium.