Use 85 mL (1/3 cup) for every 200 L (50 US gallons) saltwater or 400 L (100 US gallons) freshwater. Leave product in place for 4 days, then test phosphate or silicate concentrations with either MultiTest™ Phosphate or MultiTest™ Silicate.

Can you run PhosGuard all the time?

Continuous use of small quantities is better than intermittent use of larger quantities. It is not recommended to overdose PhosGuard, as this can lower phosphate levels too rapidly and stress sensitive invertebrates. For reducing extremely high phosphate levels, replace PhosBond every 4 days.

How much phosphate does PhosGuard remove?

PhosGuard has a working capacity to remove 20 to 60 mg/L phosphate in 100 gallons with a similar impact on silicates. It may be used continuously or intermittently, and will not release removed phosphate.