Seachem Reef Fusion2, 4-Liter/1-Fluid Gallon – Alkalinity Maintainer for Reef Aquarium – 9.04 Pounds

Price: $66.73
(as of Feb 26, 2026 09:37:27 UTC – Details)

Reef Fusion 1 and Reef Fusion 2 are the foundation of a system formulated to provide the essentials for the reef aquarium. Reef Fusion 1 provides calcium, while Reef Fusion 2 provides alkalinity. When used together, the Reef Fusion system will maintain calcium and alkalinity levels. Reef Fusion 1 provides not only 100,000 mg/L of ionic calcium, but also includes biologically appropriate levels of magnesium, strontium, boron, iron, manganese, and molybdenum. Reef Fusion 2 contains a mixture of carbonates and bicarbonates at an alkalinity of 4400 meq/L. It is designed to restore and maintain alkalinity in the reef aquarium and provide calcareous species with the essential carbonate needed for growth. When used as directed, Reef Fusion 1 and Reef Fusion 2 will maintain the critical levels of calcium and alkalinity necessary for healthy coral growth, while providing biologically appropriate levels of other elements and trace minerals.
Is discontinued by manufacturer ‏ : ‎ No
Product Dimensions ‏ : ‎ 11.43 x 17.48 x 29.21 cm; 4.54 kg
Date First Available ‏ : ‎ Aug. 7 2012
Manufacturer ‏ : ‎ Seachem
Place of Business ‏ : ‎ FAIRBURY, NE, 68352 US
ASIN ‏ : ‎ B003I5QSY6
Item model number ‏ : ‎ 1219
Country of origin ‏ : ‎ USA
Best Sellers Rank: #68,417 in Pet Supplies (See Top 100 in Pet Supplies) #368 in Aquarium Filters
Customer Reviews: 4.6 4.6 out of 5 stars (176) var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });

Raises carbonate alkalinity; Two part system maintains calcium and alkalinity levels
Contains a mixture of carbonates and bicarbonates designed to restore and maintain alkalinity in the reef aquarium
Provides calcareous species with the essential carbonate needed to grow
When used as directed Reef Fusion 1 and Reef Fusion 2 will maintain the critical levels of calcium and alkalinity necessary for healthy coral growth
500 milliliters treats 3250 gallons