Reef Basis Potassium is a high quality, maximum strength ionic potassium solution which is stronger than most competing products and designed to safely raise the potassium level in marine aquariums, providing essential potassium for increased growth rates in stony corals, and increased coloration. It contains no acetate, gluconates, polygluconates or other unnecessary organics to pollute your aquarium. It is phosphate and silicate free. May be used simultaneously with Kalkwasser. Potassium is required for formation of aragonite in scleractinians and required for color pigmentation in many corals, particularly small polyped stonies of blue and purple hues. Potassium can be depleted through heavy animal population and may be lacking in economy salt mixes. Continuum recommends that you maintain a potassium level of between 380 and 405 mg/L (ppm), a calcium level of between 410 and 450 mg/L (ppm), an alkalinity level of 7 to 11 dKH (2.5 to 4 meq/L), and a magnesium level of 1250 to 1350 mg/L (ppm). Note: Aquarists keeping SPS corals should consider keeping alkalinity at 7 to no more than 9 dKH (2.5 to 3.21 meq/L). Do not add Reef-Basis Potassium to buffering (alkalinity) products.