Seachem PhosGuard is a high-capacity, spherical filtration media designed for the rapid removal of inorganic phosphates and silicates from both marine and freshwater aquariums. Unlike many competing products, PhosGuard features a unique bead-like shape that promotes optimal hydrodynamics, ensuring maximum water flow through the media for peak efficiency. By permanently binding these nutrients, PhosGuard helps eliminate the primary fuel for nuisance hair algae and diatoms, leading to a cleaner, healthier aquatic environment.
PhosGuard is engineered to provide an immediate impact on water chemistry, making it the premier choice for emergency nutrient spikes and long-term maintenance.
Spherical Shape for Optimal Flow: The unique bead geometry prevents the media from "channeling" or clogging, allowing water to pass through the entire volume of the media rather than just around the edges.
Permanent Nutrient Binding: Once phosphates and silicates are adsorbed, they are chemically locked to the media and will not leach back into the water column, even after the media is exhausted.
High-Porosity Aluminum Oxide: Features an exceptionally high surface area for rapid adsorption, capable of removing 20–60 mg/L of phosphate per liter of media.
Algae & Diatom Control: Specifically targets silicates, the primary cause of brown "dust" algae (diatoms) in new setups, and phosphates, which fuel green hair algae.
Reef & Fish Safe: Extensive testing confirms that under standard reef conditions (pH near 8.0), PhosGuard is insoluble and safe for sensitive soft-bodied corals and invertebrates.
How much Seachem PhosGuard should I use?
Use 85 mL (1/3 cup) for every 200 L (50 US gallons) of saltwater or 400 L (100 US gallons) of freshwater. Place the media in a high-flow area of your filter or sump using a fine-mesh bag.
How often should I replace PhosGuard?
In high-phosphate environments, PhosGuard can exhaust in 4–5 days. Test your water weekly; if phosphate levels begin to rise or fail to drop below 0.02 mg/L, it is time to replace the media.
Do I need to pre-wet the media?
Yes. PhosGuard may generate heat upon initial contact with water. It is highly recommended to pre-wet the product by adding it to a double volume of freshwater before adding it to your system.
Can I use this in a planted tank?
It is generally not recommended for planted tanks, as aquatic plants require a baseline level of phosphate (0.25–1.0 mg/L) to thrive.
Seachem Purigen: Use alongside PhosGuard for the ultimate "clarity duo," removing both organic waste and inorganic phosphates.
Seachem The Bag: A 180-micron mesh filter bag perfectly sized to hold PhosGuard beads without restricting water flow.
https://petstore.ae/products/the-bag-aquarium-filter-bag-seachem?_pos=2&_sid=89a861219&_ss=r
