Nano-Tech Phosphree 500ml by Maxspect
Nano-Tech Phosphree is a polymer resin that is chemically stable and does not leak any metal ions into the water column unlike metal-based absorbents.
Granular ferric oxide or GFO not only clouds the water when used, but also leaks small black colored particulates into the main tank. In contrast, Phosphree keeps your tank water clear and sparkling.
Rapid reduction of phosphate in the water column can stress corals and, in the worst case, may lead to Rapid Tissue Necrosis or RTN. Phosphree is specially designed to absorb phosphate at a much slower pace compared to other metal-based absorbents, giving time for corals to acclimate to the reduction of phosphate.
| Capacity | 500 ml (17 fl oz) |
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FAQ
How does Phosphree compare to granular ferric oxide (GFO) in terms of water clarity?
Phosphree maintains clear and sparkling water, unlike GFO which clouds the water and releases small black particles into the tank.
Does Phosphree release metal ions into the water?
No, Phosphree is a polymer resin and does not leak any metal ions into the water column.
How quickly does Phosphree reduce phosphate levels?
Phosphree absorbs phosphate at a slower pace compared to metal-based absorbents, allowing corals time to acclimate.

Lauren Metcalfe –
I’ve used GFO before and it always made my water look cloudy. Since switching to Phosphree, my tank has stayed crystal clear. My corals seem more vibrant and I haven’t seen any signs of stress or tissue necrosis. It’s a noticeable improvement in water quality.
Simon Wilson –
The water clarity has improved significantly since I started using Phosphree. It doesn’t cloud the tank like GFO does. I appreciate the slow phosphate absorption—it gives my corals time to adjust without stress.
Edward Bailey –
After a few weeks of use, my tank water is consistently clear. No black particles in the water, and I haven’t had any coral issues. The 500ml size is sufficient for my 120-liter reef tank.