How do I use PhosGuard? How long does it work and when is it exhausted?
PhosGuard is best used in smaller quantities and changed frequently. In an environment with an excessively high phosphate reading, PhosGuard will exhaust rapidly (4 – 5 days). Place the product in a high flow rate area and test your phosphate levels, changing as needed. When you see that your level is below 0.2 ppm (mg/L) leave that portion of PhosGuard in the filter. PhosGuard may yellow somewhat as it picks up organics, but that is not an indicator of exhaustion for phosphate removal. Continue to test weekly for phosphate until you see it begin to rise again. You will then know that it is time to change the PhosGuard. If you have low levels of phosphate the PhosGuard will absorb the silicate in your system. It’s inert and safe to leave in your filter.
Is PhosGuard regenerable?
Although some manufacturer’s claim that their aluminum oxide based phosphate removing products can be regenerated by intense heat, this is, unfortunately, not the case. That claim is based on a naive interpretation of the information provided by manufacturers of bulk aluminum oxide. Aluminum oxide is more commonly used in gas purification to remove volatile organics and moisture; heating the material after such use will release the non-covalently adsorbed compounds. However, heat cannot result in phosphate release from aluminum oxide due to a difference in the nature by which phosphates are bound to aluminum oxide versus adsorbed gases.
If PhosGuard doesn’t release aluminum that will stress corals, then why did my corals close a day after I added PhosGuard?
Phosphate plays a major role in the chemistry of the aquarium, and an overdose of PhosGuard is capable of very rapidly lowering the phosphate concentration in the aquarium. If an overdose of PhosGuard is used, it is possibly to lower the phosphate concentration so quickly that corals become stressed.
Can I use PhosGuard in a media reactor?
We do not recommend it, as the tumbling action of a media reactor can cause this media to produce dust.