Reef•Basis Captiv Phos W 600gThe Continuum advantage. ReefBasis Captiv Phos W is a supreme quality, spherical white proprietary filtration medium particularly selected for sensitive aquarium environments. It is designed to remove free phosphates and silicates that can act a fertilizer for unwanted algae or diatoms, directly from the water. It will not kill algae and does not contain any algaecides. It is safe for all marine and freshwater life. Use in aquarium keeping. Phosphates
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