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Corals and other invertebrates are sensitive to any level of phosphate (PO4), and it is also a food source for many types of troublesome algae. Typically the best way to reduce the accumulation of phosphate in aquariums is to perform repetitive water changes, but with advances in science, there are now several excellent products that are easy to use to remove harmful phosphate from aquariums quickly and safely. From granulated media to simple pads, here's a variety of popular products to choose from that can help solve your phosphate woes.
Phosguard by SeaChem efficiently removes phosphates and silicates from marine or freshwater aquaria. PhosGuard is bead-shaped for optimum flow characteristics and has an exceptional porosity for enhanced capacity.
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.
With the Poly-Bio Filter Pad by Poly-Bio-Marine, Inc., water impurities like phosphate, nitrate, copper, silicate, and even ammonia are absorbed. The pads can be regenerated by simply rinsing in saltwater (saltwater use can be regenerated by the reverse, rinsing in freshwater).
PhosPure by Drs. Foster & Smith Combines three chemical filter media: Carbon, an ammonia remover, and a phosphate remover which are embedded in a polyester matrix. These pads are easy-to-use and cost-effective. Removes phosphate, ammonia, organic waste, heavy metals, discoloration, and even residual medication. Simply cut these multipurpose pads for custom use in power filters, canister filters, or wet/dry filters.
Phosphate Sponge by Kent Marine is a ceramic medium which adsorbs phosphate within hours when placed directly in water flow. This product works in fresh or saltwater to bring about 1.0 ppm of phosphate or silicates to less than .05 ppm in a 120-gallon aquarium for every dry quart of the medium.