Api Buffer Max Marine Aquarium water buffer that stabilizes and maintains pH for when pH drops below 8.2 Benefits: Raises & holds pH to 8.2-8.4 for ideal marine conditions Makes calcium available for corals Follow the API Easy Care Guide and use MARINE BUFFER MAX when: pH levels drop below 8.2 in an established aquarium Maintaining KH, essential to corals that utilize calcium Stabilizes and maintains pH for ideal marine conditions. Increases carbonate hardness (KH) to buffer (or hold) pH to 8.2-8.4. Use with API MARINE CALCIUM to balance calcium and carbonate levels in reef aquariums.