Seachem PhosNet GFO 500g – Phosphate & Silicate Remover for Aquariums

Seachem PhosNet (GFO) 500g is a professional-grade granular ferric oxide filtration media designed for powerful and long-term phosphate and silicate removal in freshwater and saltwater aquariums. Elevated nutrient levels can lead to algae outbreaks and poor water quality—PhosNet helps maintain ultra-low phosphate and silicate concentrations for healthier aquatic systems.

Engineered with high porosity and an exceptionally large surface area, PhosNet delivers superior binding capacity compared to most competing GFO products. It will not release absorbed nutrients back into the water and produces significantly less dust, making it cleaner and easier to use. The 500g size is ideal for large aquariums, reef systems, or continuous nutrient management.

Key Features:

• Rapidly removes phosphate and silicate
• Synthetic granular ferric oxide (GFO)
• High porosity and superior binding capacity
• Reduces nutrients to ultra-low levels
• Will not leach phosphate or silicate back into water
• Low-dust formulation for easy handling
• Safe for freshwater and saltwater aquariums
• Ideal for large reef tanks and algae control

Seachem PhosNet GFO 500g delivers high-capacity nutrient control for large or heavily stocked aquariums. Its strong binding capacity, non-leaching performance, and low-dust design make it a dependable choice for reef keepers and freshwater aquarists seeking stable, algae-free water conditions.