Florida Crushed Coral is the only crushed coral with aragonite, which provides up to 25 times the buffering power of other crushed corals, dolomite, or oyster shell. It eliminates chronic pH problems and provide maximum surface area for water purifying bacteria. CaribSea's Florida Crushed Coral with aragonite allows an increase in bio-load by up to 50% and it never needs replacement. No rinsing required.