Phosguard by Seachem Laboratories
Phosguard is a highly effective chemical solution designed to rapidly remove phosphate and silicate from aquarium water. It is ideal for both marine and freshwater aquariums where excessive phosphate and silicate levels can lead to algae growth and water quality issues.
Key Features
- Targets phosphate and silicate buildup
- Optimized for efficient water circulation and contact
- Safe for use in marine and freshwater environments
Specifications
| Component | Value |
|---|---|
| Active Ingredients | Phosphate and silicate chelating agents |
| Form | Clear liquid |
| Volume | 500 mL |
| Application | For use in aquariums (marine and freshwater) |
FAQ
How often should Phosguard be used?
The frequency depends on water test results. Use as needed when phosphate or silicate levels exceed recommended thresholds, typically every 1-2 weeks in active systems.
Is Phosguard safe for fish and invertebrates?
Yes, Phosguard is formulated to be safe for fish, invertebrates, and beneficial bacteria when used as directed.
Can Phosguard be used in both marine and freshwater tanks?
Yes, Phosguard is suitable for both marine and freshwater aquariums.

Heather Edmunds –
I’ve used Phosguard for three months now and noticed a significant reduction in algae growth. My freshwater tank has been much cleaner and more stable. Easy to mix and effective after just one application.
Jan Bell –
Works well in my marine tank. I test water weekly and see phosphate levels drop noticeably. It doesn’t affect water chemistry or fish behavior.
Jessica Short –
Great product for preventing algae. I added it monthly and my tank stays clearer. No side effects on corals or fish. Highly recommend for any aquarium with silicate issues.