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Marine ProlongTM ACPTM Marine ProlongTM is a combination pH adjuster/alkalinity booster/trace element replenisher. Scientific research has demonstrated when pH declines there is a reduction of carbonate hardness and certain essential trace ions are no longer present at useable levels or values. Marine ProlongTM is a simple, easy to use one step additive that will boost alkalinity, adjust pH, and replenish essential trace elements. Marine ProlongTM helps safeguard all marine fish and reef invertebrates against possible disease due to low pH and ionic deficiencies.