Seachem Reef Builder 1.2kg is a premium supplement specifically formulated for saltwater reef aquariums, designed to effectively raise carbonate alkalinity. This powerful additive achieves its goal without causing an immediate impact on your tank's pH levels, ensuring a more stable and controlled environment for your delicate corals and marine life. It is an essential component for maintaining healthy water chemistry in a thriving reef system.

With consistent use, Reef Builder will gradually work to stabilize your aquarium's pH at an optimal level of 8.3, fostering long-term stability. A key feature is its formulation which prevents the depletion of vital elements such as calcium, magnesium, and strontium, which often precipitate when alkalinity increases. This product can be safely used in conjunction with Seachem Reef Buffer, offering flexibility to either raise alkalinity without affecting pH (Reef Builder) or raise both alkalinity and pH (Reef Buffer). Optimal reef alkalinity should be maintained between 3–5 meq/L (8–14 dKH) and should never fall below 2 meq/L.

This product is ideal for dedicated reef aquarists who prioritize precise control over their water parameters and seek to maintain a stable, high-quality environment for their corals. It is particularly beneficial for those experiencing alkalinity dips or aiming to achieve a specific alkalinity range without the risk of sudden pH fluctuations. By using Seachem Reef Builder, hobbyists can confidently support robust coral growth and overall reef health, making it a cornerstone for advanced and beginner reef keepers alike.