IceCap High-Capacity GFO, Large 5.75lbs

IceCap High-Capacity Granular Ferric Oxide (GFO) Filter Media — Large 5.75lbs (IC-GFOHC-LG)

The IceCap Large High-Capacity GFO 5.75lb Jug (SKU: IC-GFOHC-LG) is an authentic, laboratory-grade chemical filtration media distributed by CoralVue to offer advanced, large-scale nutrient management across progressive marine reef setups, heavily stocked fish-only aquariums, and multi-tank filtration displays. Phosphates are a persistent challenge in managed aquatic systems, entering via heavy fish feedings and tap water sources; left unchecked, excess phosphates spark aggressive outbreaks of nuisance hair algae or cyanobacteria and directly inhibit coral calcification. The IC-GFOHC-LG 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 under pressure, this high-capacity variation is synthesized to be twice as dense. This means you can pack double the chemical binding capacity into a smaller space inside your reactor chamber, significantly reducing maintenance frequencies. Additionally, the enhanced hardness of these granules makes them remarkably resistant to friction. When used in active upflow media reactors, such as the IceCap 120INT or 120EXT series, the media stands up to constant fluidization without grinding down into fine dust. Packed in a rugged 5.75-pound storage jug with an integrated handle, this configuration delivers professional-grade clarity at an exceptional value for large display owners.

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 systems.

• (Note: This filtration package includes 5.75 pounds of loose high-capacity GFO packaged within a resealable storage container. 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.