API Rena Nexx - Prevent Algae Size 4

API Prevent Algae controls silicate and eliminates cloudy water caused by  phosphates.

API Prevent Algaeis scientifically proven to remove phosphate and silicate, common  nutrients found in fresh and saltwater aquariums.

It reduces maintenance. Promotes the growth of reef-building corals and prevents calcium precipitation caused by excess phosphate. Safe for all fish, invertebrates and planted aquariums.

Prevent Algae offers multi-stage filtration to remove small and large aquarium pollutants. 4 sized micro filtration pad cartidge for mechanical filtration, filled with superior resins for chemical filtration. 100% of water passes through the cartridge for best eficacy. No by-pass. Easy to change - no mess.

Rena Nexx replacement Prevent Alage cartridge for the Nexx filter and Nexx filter extension.

Size 4 two cartridges included.