d-d rp-100 rowaphos phosphate removal media - 1000 ml/2.2 lbs deltec usa if your phosphate problem just won't go away, give rowaphos a try considered the most effective phosphate/silicate remover by many expert aquarists, rowaphos is specially designed to be used with a fluidized reactor. perfect for fragile reef systems, rowaphos is gentle and will not shock the animals in your aquarium. also, regardless of how long you let it in your aquarium, rowaphos will never release anything back into the water. try the expert's choice for your phosphate problem: rowaphos.