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Kent Marine Kalkwasser Mix provides bio-available calcium for lush growth of purple, pink and green calcareous algaes, snails, hard tube worms and clams. With regular use corals will open more and stay attached to their skeletons better. Phosphate & nitrate free. Contains no gluconates, EDTA, or other organics to raise DOC levels. Kalkwasser Mix can be used with Kent Marine Concentrated Liquid Calcium or Turbo Calcium for maximum results. Strontium addition via use of Kent Marine Strontium & Molybdenum Supplement or Turbo Strontium is absolutely necessary, as well. Also, of Coral Vite, and Essential Elements are beneficial.