The 6 Best Phosphate (PO4) Removing Products

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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.

Our Top Picks

Seachem PhosGuard 1 Liter


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.

Poly-Bio-Marine Filter PAD

Poly-Bio Filter Pad by Poly-Bio-Marine

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).

Simply roll or cut the pad to any shape, place it inside a canister filter or incorporate it into any type filtration system to easily remove troublesome elements in saltwater aquariums.

API PHOS-ZORB Aquarium Canister Filter Filtration Pouch


Phos-Zorb by Rena Filstar is a filtration material that selectively removes phosphate and silicate. Phos-Zorb is available in bulk or handy 150 g pouches.

Two Little Fishies Phosban


PhosBan is manufactured by Two Little Fishies. These synthetic ferric oxide hydroxide granules have an extremely high capacity for adsorbing phosphate from saltwater and freshwater. Also, it adsorbs silicate and does not release adsorbed substances.

API PHOS-ZORB Aquarium Canister Filter Filtration Pouch


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.

Kent Marine Phosphate Sponge 1.2 Lbs

Phosphate Sponge by Kent Marine

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.