Brightwell Aquatics ABAPTS2L Potassion Liquid Salt Water Conditioners for Aquarium, 67.6-Ounce Highly-Concentrated Ionic Potassium Solution. Provides Potassium, An Important Component Of Aragonite (The Mineral Secreted As Skeletal Material By Corals And Other Reef-Building Marine Organisms), Complexes Into Pigments That Enhance Blue Coloration Of Some Small-Polyp Stony Corals, Important T 80,000 ppm K Considerably Stronger And More Economical Than Competing Potassium Products. May Be Used To Combat Potassium Depletion That Often Accompanies The Use Of Zeolite-Based Filtration Methods Employed To Maintain Ultra-Low-Nutrient Aquaria.