Seachem Reef BuilderÃ¢â€Â¢ raises carbonate alkalinity without immediately impacting on pH. With long term use there will be a tendency to stabilize at pH 8.3. Carbonates and calcium are essential to all coral growth. If either becomes deficient, coral growth will cease, followed by a rapid decline in coral health. Used as directed, Reef BuilderÃ¢â€Â¢ will not deplete calcium, magnesium, or strontium which usually tend to precipitate with increasing alkalinity. Reef BuilderÃ¢â€Â¢ and Reef BufferÃ¢â€Â¢ may be used together. Use Reef BuilderÃ¢â€Â¢ to raise carbonate alkalinity without affecting pH. Use Reef BufferÃ¢â€Â¢ to raise carbonate alkalinity and pH. 500 g treats 32,000 L (8,000 gallons).