IceCap GFO Large 4lbs

IceCap Standard Granular Ferric Oxide (GFO) Filter Media — 4lbs (IC-GFO-LG)

The IceCap Standard GFO 4lb Jar (SKU: IC-GFO-LG) is an authentic, laboratory-grade chemical filtration media distributed by CoralVue to offer targeted, predictable nutrient management in progressive marine reefs and high-load freshwater aquariums. Elevated phosphate levels are one of the most common hurdles to long-term aquarium success; left unmanaged, excess phosphates fuel aggressive outbreaks of green hair algae or cyanobacteria and chemically block corals from building calcium skeletons. The IC-GFO-LG steps in as an indispensable nutrient sponge, using a highly porous iron oxide matrix to snare and permanently trap unwanted phosphate and silicate molecules out of the water column before they can fuel an environmental imbalance.

Unlike dense, heavy "high-capacity" GFO variations that require specialized high-pressure pumps to move, IceCap's standard granular layout features an intentionally lighter, high-surface-area architecture. This makes it incredibly easy to fluidize inside standard upflow canisters, such as the IceCap INT or EXT media reactor series. As water moves vertically through the granular bed, each particle lightly simmers, continuously exposing new chemical binding sites to the water stream without compressing or creating low-flow channel paths. Safe, reliable, and completely free of toxic fillers, this larger 4-pound configuration offers additional volume for large aquariums, heavily stocked systems, or hobbyists who prefer purchasing filtration supplies less frequently.

Key Features

• Mitigates Nuisance Algae Proliferation: Directly starves invasive green hair algae, bubble algae, and film diatoms by lowering water phosphates to natural, undetectable coral reef baselines (~0.02 ppm).

• Protects Inhabitant Respiration: Provides an iron-based chemical lock that never leaches trapped nutrients back into the water grid, even when the media passes its structural saturation threshold.

• Prevents Dense Media Clumping: The tailored standard granular shape resists sticking together under stable flow conditions, maximizing contact time across the entire canister volume.

• (Note: This filtration package includes 4 pounds of loose standard GFO within a resealable storage jar. Fluidizing media reactors, mesh media bags, and chemical water test kits are sold under separate product categories).

IceCap GFO Filter Media Bulk Sizing Matrix