FAQ: How do I use Seachem 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.