GFO | Granular Ferric Oxide | 16 oz | Bulk Reef Supply

Bulk Reef Supply GFO (Granular Ferric Oxide) – 16 oz

Bulk Reef Supply GFO (Granular Ferric Oxide) is a premium phosphate-removal media designed to help reef keepers maintain ultra-low nutrient levels for healthier corals and cleaner aquariums. By efficiently adsorbing phosphate and silicate from aquarium water, BRS GFO helps reduce nuisance algae, improve coral coloration, and create a more stable environment for SPS, LPS, and soft corals.

Manufactured from high-capacity granular ferric oxide, this media is ideal for use in media reactors or high-flow media bags. Whether you're battling elevated phosphate or maintaining an established reef aquarium, BRS GFO is one of the most trusted solutions for long-term nutrient control.

Key Benefits

• Rapidly removes phosphate (PO₄) from aquarium water

• Helps reduce silicate to discourage diatom growth

• Supports vibrant coral coloration and healthy growth

• Helps control nuisance algae

• High-capacity granular ferric oxide media

• Suitable for media reactors or media bags

• Safe for reef and marine aquariums

• Trusted by reef hobbyists and professionals

Why Control Phosphate?

Excess phosphate is one of the leading causes of nuisance algae and can inhibit skeletal growth in stony corals. Keeping phosphate within an appropriate range helps promote:

• Improved SPS coloration

• Faster coral growth

• Reduced nuisance algae

• Better water clarity

• Long-term reef stability

Regular phosphate management is an important part of maintaining a successful reef aquarium.

Premium Granular Ferric Oxide

BRS GFO is engineered with a high surface area, allowing it to effectively bind phosphate and silicate as water passes through the media. For maximum efficiency, use GFO in a media reactor with gentle flow to keep the media lightly tumbling. It can also be placed in a fine mesh media bag in a high-flow area of your sump or filter.

Replace the media as phosphate levels begin to rise or according to your aquarium's nutrient demands.

Ideal For

Bulk Reef Supply GFO is recommended for:

• SPS reef aquariums

• Mixed reef tanks

• LPS coral systems

• Fish-only saltwater aquariums

• Coral propagation systems

• Sumps and filtration systems

• Media reactors

• High-flow filter media bags

Product Features

• 16 oz (454 g) container

• High-capacity granular ferric oxide (GFO)

• Removes phosphate and silicate

• Helps reduce nuisance algae

• Compatible with media reactors and media bags

• Suitable for all marine and reef aquariums

• Long-lasting filtration media

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