Kent Marine Kalkwasser Mix 450-gm.
Kalkwasser Mix provides bio-available calcium for lush growth of purple, pink and green calcareous algae, snails, hard tube worms and clams. Corals will open more and stay attached to their skeletons better, with regular use.
Phosphate & nitrate free
Contains no gluconates, EDTA, or other organics to raise DOC levels, as many competing products do