Seachem PhosNet

$7.99 ~~$12.49~~ In stock

Category: Aquarium Water Treatment

Seachem PhosNet

Rapidly removes phosphate & silicate
Synthetic granular ferric oxide (GFO)
Less dust and thus is easier to use than most competing GFO products

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.

Sizes:

50g
125g
250g
500g

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Customer Reviews (4.5 / 5 · 4 reviews)

Brian H. ★★★★★ Oct 20, 2026

After fighting cloudy water from phosphates for weeks, this stuff finally worked—my test kit went from 1.5 ppm to zero in three days. The granules really do produce less dust than other GFO I've tried, making setup much cleaner and faster.

Scarlett ★★★★★ Oct 18, 2026

It’s refreshing to find a GFO that doesn’t cloud the water with dust—this stuff really is clean right out of the bag. My phosphate level dropped noticeably within two days, and the granules are easy to rinse.

Lucy C. ★★★★☆ Oct 21, 2026

I’ve been using this GFO for a few weeks and it’s definitely less dusty than my old brand—setup was way cleaner. My phosphate levels dropped noticeably within days, though I wish the granules were a bit more uniform in size for canister filters. Still, it does the job well for the price.