Kent Marine's Osmo-Prep Marine is a specially formulated mixture containing buffering compounds, together with calcium, magnesium, potassium, and minor minerals. Reconstitutes reverse osmosis, distilled or deionized water to provide a base for mixture of seawater mixes for marine aquariums. Particularly useful to assist in establishing proper calcium, magnesium and buffer levels for reef aquariums. Provides heavy calcium and magnesium to assist deficient or poorly designed salt mixes. Contains no phosphates, nitrates, silicates, or organics to pollute the system!

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