Seachem Phosguard

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

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

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

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 aluminium solubility and aluminium toxicity.

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

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