B-Ionic's 2-part system eliminates the complexity of managing calcium & alkalinity. Cost-effective & simple to use, it meets the extensive calcium & carbonate alkalinity needs of aquariums without requiring separate powders or chemicals. It provides the full range of essential elements & replicates natural seawater, plus replenishes ions lost during protein skimming & keeps aquariums in ionic balance. Ready-to-use & concentrate options in 32oz., 64oz., 2 gal., 8 gal., 10 gal., & 20 gal. sizes.