Seachem PhosGuard 4000ml (4L) – Phosphate & Silicate Remover for Reef Aquariums

Seachem PhosGuard™ 4000ml is a high-capacity phosphate and silicate removal media designed for large reef and marine aquarium systems. By rapidly binding excess nutrients, PhosGuard™ helps prevent algae growth, improves water clarity, and supports a healthier environment for corals and marine life.

Manufactured with a highly porous, spherical bead structure, PhosGuard™ allows optimal water flow through and around the media, maximizing contact time and filtration efficiency. Its irreversible binding technology ensures that once phosphate and silicate are removed, they will not leach back into the aquarium water.

While effective in both marine and freshwater aquariums, PhosGuard™ performs best in saltwater systems and is not recommended for phosphate-buffered freshwater tanks. Ideal for use in media reactors, canister filters, sumps, or other high-flow filtration areas, this 4L size is perfect for high-demand or commercial reef setups.

Key Features:

• Rapidly removes phosphate and silicate
• Ideal for large reef and marine aquariums
• Helps control nuisance algae
• Spherical bead design for optimal hydrodynamics
• Highly porous media for maximum efficiency
• Irreversible binding – no nutrient leaching
• Suitable for canister filters, sumps & media reactors
• Safe for marine and non-buffered freshwater systems
• Reusable until fully exhausted

Seachem PhosGuard 4000ml is a professional-grade nutrient control solution for reef aquariums requiring high-volume filtration. Its advanced bead-shaped structure and irreversible binding action deliver reliable phosphate and silicate removal without releasing contaminants back into the water. A trusted choice for serious reef keepers, available now at Reef Freaks.