Bayoxide E33HC GFO Phosphate Reducer combats algae in both freshwater and saltwater aquariums by removing phosphates, their sole food source. Algae can inflict grave harm to fish, coral and other aquatic life, and our high-capacity GFO reducer absorbs up to twice as much phosphate as our standard media for extended efficacy. The outcome? Crystal-clear water, a healthier tank climate and less time spent on maintenance. Benefits: Rapidly eliminates phosphates Delivers superior silicate, arsenic and heavy metal removal Stops and prevents stubborn algal growth Highest phosphate reduction capacity for saltwater Long-lasting effectiveness Low dust and fines Hard and dense material reduces abrasion Perfect for use in reactors Enhances habitat for plants and animals Suitable for all fresh and saltwater tanks, ponds, pools and aquaculture facilities Ideal for reefs and high-end marine tanks Best employed in reactors, filter socks, canister filters and cartridge filters.