PhosNet™ 250ml
PhosNet™ is a granular ferric oxide (GFO) with high porosity, high surface area and high binding capacity. It will rapidly remove phosphates and silicates from both freshwater and saltwater and will not release them back into your aquarium. It exhibits stronger binding than most competing products and consequently can reduce phosphates and silicates to very low levels. PhosNet™ also offers less dust and thus is easier to use than most competing GFO products.
- Rapidly removes phosphate & silicate
- Synthetic granular ferric oxide (GFO)
- Less dust and thus is easier to use than most competing GFO products
| Specification | Value |
|---|---|
| Product Type | Granular Ferric Oxide (GFO) |
| Volume | 250ml |
| Target Ions | Phosphate, Silicate |
| Application | Freshwater and Saltwater Aquariums |
FAQ
How long does it take for PhosNet™ to start removing phosphates and silicates?
PhosNet™ begins to remove phosphates and silicates rapidly upon addition to the aquarium system. Full effectiveness is typically observed within a few days of use, depending on the initial concentration of these compounds.
Can PhosNet™ be used in both freshwater and saltwater aquariums?
Yes, PhosNet™ is effective in both freshwater and saltwater aquariums for the removal of phosphates and silicates.
Does PhosNet™ release the removed ions back into the water?
No, PhosNet™ does not release phosphates or silicates back into the aquarium once they have been bound.

Sebastian Arnold –
I’ve used PhosNet™ for several months in my freshwater tank. The phosphate levels dropped significantly after just a week. It’s much easier to handle than other GFO products because it produces less dust. No noticeable changes in water chemistry or fish behavior.
Alexandra Ross –
Good product for reducing phosphate buildup. Works well in a planted tank. I found it easier to mix and store than other granular ferric oxide options. Slight improvement in water clarity after a few weeks.
Andrew Churchill –
Used in a saltwater reef tank. The silicate levels dropped quickly, and the water became clearer. The product is easy to dose and doesn’t create much dust during handling. Very effective and reliable.