Seachem PhosGuard Phosphate and Silicate Remover
PhosGuard by Seachem Laboratories is designed to swiftly eliminate phosphate and silicate from both marine and freshwater aquarium environments. It is not suitable for use in phosphate-buffered freshwater setups. With its highly porous structure, PhosGuard offers exceptional capacity, and its bead-like shape ensures optimal water circulation. It surpasses other similar products in performance. A 500 mL container can effectively treat more than 150 gallons*. Note that this item is sold by volume, and the listed weight is the minimum. Available at ReptileSupply.com.
Product Specifications
| Parameter | Volume: 500 mL |
|---|---|
| Target Contaminants | Phosphate and Silicate |
| Application | Marine and Freshwater Aquariums |
| Usage Note | Not recommended for phosphate-buffered freshwater systems |
| Treatment Capacity | Over 150 gallons* |
FAQ
Can PhosGuard be used in a freshwater aquarium with phosphate buffering?
No, PhosGuard is not suitable for use in phosphate-buffered freshwater setups.
How much water can 500 mL of PhosGuard treat?
A 500 mL container can effectively treat more than 150 gallons.
Is PhosGuard safe for marine and freshwater fish?
Yes, PhosGuard is safe for use in both marine and freshwater aquarium environments.

Samantha Scott –
I’ve used PhosGuard in my 100-gallon freshwater tank for three months. The phosphate levels dropped significantly, and my plants are thriving. The product dissolves easily and doesn’t cloud the water. Works well with my existing filtration system.
Charles Nash –
It’s effective at reducing silicate and phosphate. I noticed a difference within a week. The beads stay suspended and don’t clump. Only downside is it doesn’t work in phosphate-buffered systems, so I had to adjust my setup.
Natalie Lee –
Great product for a planted tank. I’ve seen algae reduce dramatically after adding PhosGuard. The 500 mL size lasts longer than expected and fits well in my filter system.