Descriptions
- Removes silicate and phosphate
- Spherical for optimal hydrodynamics
- Irreversible binding
PhosGuard™ rapidly removes phosphate and silicate from marine and freshwater aquaria. Although PhosGuard™ is effective in both fresh and marine water, it will operate better in sea water and the need for it is better defined in sea water. It is not recommended for phosphate buffered freshwater (PhosGuard™ would remove the buffer until saturated). PhosGuard™ is highly porous and bead-shaped to promote easy water flow through and around it, thereby increasing both its efficiency and capacity.
FAQ
Can PhosGuard be used in freshwater aquariums?
PhosGuard can be used in freshwater aquariums, but it is not recommended for phosphate-buffered freshwater systems as it may remove the buffer until saturation.
How does PhosGuard work in water?
PhosGuard works by irreversibly binding phosphate and silicate ions in the water, removing them from the system through its porous, spherical structure.
Is PhosGuard effective in marine water?
Yes, PhosGuard operates more effectively in marine water where phosphate and silicate levels are typically higher and more problematic.

Una Sutherland –
I’ve used PhosGuard in my marine tank for six months and noticed a significant drop in phosphate levels. The water clarity improved and algae growth stopped. Easy to add and doesn’t affect water parameters otherwise.
Samantha James –
Works well in my saltwater aquarium. I added it monthly and saw less algae buildup. The beads stay intact and don’t break apart during water changes.
Olivia Bond –
Great product for controlling silicate and phosphate. It’s been stable over several months and has kept my tank balanced without any side effects.