ReefPure Balanced Ion Potassium Supplement ReefPure Balanced Ion Potassium Supplement provides essential Potassium for the growth and coloration of hard corals including SPS corals. ReefPure Balanced Ion Potassium Supplement is a unique product that contains a proprietary blend of Potassium salts formulated to have a minimal effect on the ionic balance of the aquarium. ReefPure Balanced Ion Potassium Supplement is extremely concentrated containing nearly 60,000 ppm of Potassium. As with all ReefPure products, ReefPure Balanced Ion Potassium Supplement contains no Phosphates, Silicates, preservatives, chelating agents and dyes. Potassium levels become depleted naturally and supplementation is neccessary to correct the imbalance. In addition, many salt mixes are defficient in Potassium. Contains: 5-Stage Reverse Osmosis/Deionized Water and Blended Potassium Salts.