Seachem PhosNet GFO 250g – Phosphate & Silicate Remover for Aquariums

Seachem PhosNet (GFO) 250g is a high-capacity granular ferric oxide filtration media engineered to rapidly and permanently remove phosphate and silicate from freshwater and saltwater aquariums. Excess nutrients can fuel algae growth and destabilize water chemistry—PhosNet helps maintain ultra-low phosphate and silicate levels for a cleaner, healthier aquatic environment.

With its high porosity, large surface area, and exceptional binding capacity, PhosNet delivers stronger nutrient adsorption than most competing GFO products. It will not leach phosphate or silicate back into the water and produces significantly less dust, making it easier and cleaner to handle. The 250g size is ideal for large aquariums, reef systems, or continuous nutrient control.

Key Features:

• Rapidly removes phosphate and silicate
• Synthetic granular ferric oxide (GFO)
• High porosity with superior binding capacity
• Reduces nutrients to very low levels
• Will not release absorbed phosphate or silicate
• Low-dust formulation for easy handling
• Safe for freshwater and saltwater aquariums
• Ideal for reef tanks and algae management

Seachem PhosNet GFO 250g offers powerful and reliable phosphate and silicate control for medium to large aquarium systems. Its strong binding capacity, non-leaching performance, and low-dust design make it an excellent choice for reef keepers and freshwater aquarists seeking long-term nutrient stability.