IceCap High-Capacity GFO, X-Large 31lb Box

IceCap High-Capacity Granular Ferric Oxide (GFO) Filter Media — Bulk 31lb Box (IC-GFOHC-XL)

The IceCap Bulk High-Capacity GFO 31lb Box (SKU: IC-GFOHC-XL) is an authentic, laboratory-grade chemical filtration media distributed by CoralVue to offer advanced, industrial-scale nutrient management across expansive show aquariums, coral propagation systems, multi-tank operations, and aquaculture facilities. Phosphates are a persistent challenge in managed aquatic systems, entering via fish foods and source water; left unchecked, excess phosphates spark aggressive outbreaks of nuisance hair algae and directly inhibit calcification—chemically blocking hard corals from building skeletons. The IC-GFOHC-XL provides a high-efficiency solution, utilizing a specially modified, ultra-dense iron oxide matrix to capture and permanently trap unwanted phosphate and silicate molecules completely out of the water grid.

The defining advantage of IceCap’s High-Capacity line is its structural density. Unlike standard, lightweight GFO grains that fracture easily, this high-capacity variation is synthesized to be twice as dense. This means you can pack double the chemical binding capacity into a reactor chamber, reducing maintenance frequency. Additionally, the enhanced hardness of these granules makes them remarkably resistant to mechanical friction. When used in active upflow media reactors, such as high-volume commercial fluidized canisters, the media stands up to constant water flow without grinding down into fine dust. This massive 31-pound commercial bulk box provides the ultimate economy-at-scale for demanding setups requiring ongoing nutrient suppression.

Key Features

• Maximum Nutrient Suppression Economy: Drops water phosphates down to natural, pristine reef baselines (~0.02 ppm), keeping decorative glass panels clear and clean for longer stretches.

• Minimized Pre-Rinse Requirements: The rugged, abrasion-resistant granule finish produces significantly less dust during shipping and handling, lowering initial flushing times.

• Safe, Permanent Chemical Lock: Adsorbed nutrients are bound on a molecular level, guaranteeing zero leaching back into high-salinity marine sumps or freshwater community systems.

• (Note: This filtration package includes 31 pounds of loose high-capacity GFO packaged within a commercial bulk shipping box. Media reactors, fluidizing pumps, mesh bags, and low-range testing colorimeters are sold under separate product categories).

IceCap High-Capacity GFO Media Sizing Matrix

Online exclusive: this item is ordered in for you and is usually ready within a few business days. Choose in-store pickup, local delivery or shipping at checkout.