Seachem PhosNet
Seachem PhosNet is a top-of-the-line filter media scientifically designed to quickly remove harmful phosphates and silicates from both freshwater and saltwater aquariums.
The media is a synthetic granular ferric oxide with a large surface area, high porosity, and the ability to quickly and efficiently bind with targeted compounds to reduce the amount of phosphate and silicate within the water column. The media will not release the compounds back into the water and is significantly less dusty than competing products.
| Key Features | Specifications |
|---|---|
| Material | Synthetic granular ferric oxide |
| Target Compounds | Phosphates and silicates |
| Surface Area | Large surface area |
| Porosity | High porosity |
| Dust Level | Significantly less dusty than competitors |
FAQ
How does PhosNet work to remove phosphates and silicates?
PhosNet uses synthetic granular ferric oxide to bind with phosphates and silicates in the water column. The binding is strong and irreversible, meaning the compounds are not released back into the water.
Is PhosNet safe for both freshwater and saltwater aquariums?
Yes, Seachem PhosNet is designed to be effective in both freshwater and saltwater aquariums without harming fish or beneficial bacteria.
Does PhosNet require any special installation or maintenance?
PhosNet can be easily installed in standard filter systems. It does not require special handling or frequent replacement, but should be rinsed gently before first use to remove dust.

Robert Henderson –
I’ve used PhosNet in both my freshwater and saltwater tanks for over six months. The water clarity has improved noticeably, and I no longer see algae growth. It’s easy to install and doesn’t create much dust during handling.
Lisa Buckland –
After switching from a standard filter media, my tank has had much better water stability. The phosphate levels dropped quickly, and the system has been running smoothly without any issues.
Jessica Bell –
The media works well and is less dusty than other products I’ve tried. I noticed a visible improvement in water clarity within a week. It’s a bit more expensive, but the results justify the cost.
Pippa Cornish –
I use it in a reef tank and have seen a significant reduction in silicate buildup. The filter runs efficiently, and the media stays effective even after several months of use.