Seachem PhosGuard 100ml

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Seachem PhosGuard 100ml bagged - removes silicate and phosphate


Seachem PhosGuard is for the removal of silicate and phosphate in both fresh water and marine aquariums.

Seachem PhosGuard 

  • Removes silicate and phosphate
  • Spherical for optimal hydrodynamics
  • Irreversible binding


PhosGuard rapidly removes phosphate and silicate from marine and freshwater aquaria. 

It is not recommended for phosphate buffered freshwater.

PhosGuard is highly porous for high capacity and bead-shaped for optimum water flow.

Aluminum Oxide, Soluble Aluminum, and Coral Toxicity 

In recent years, there has been speculation that aluminum oxide based phosphate removers like PhosGuard release aluminum into the water and subsequently damage corals. 

The evidence to support this claim was largely anecdotal.


So, through a series of controlled experiments in both freshwater and saltwater, we intended to address both the question of aluminum solubility and aluminum toxicity. 

The results of these experiments show that under reef conditions (pH near 8) there is no detectable soluble aluminum released from alumina. 

Under conditions of low pH and high dosage levels, soluble aluminum can be released from alumina; at three times the label dosage rate, we detected 0.2 mg/L aluminum at a pH of 5.3.


Additionally, aluminum oxide is not easily absorbed into the cell to cause negative reactions. 

Even at three times the dose of PhosGuard, soft-bodied corals such as Sarcophyton remain unaffected.



SKU 6361
Brand seachem
Shipping Weight 0.2500kg
Shipping Width 0.090m
Shipping Height 0.230m
Shipping Length 0.150m
Shipping Cubic 0.003105m3

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