Arcadia Bio Phos 80 is a high capacity synthetic Iron Hydroxide, suitable for use in any aquarium with a Ph of between 5 and 10. Arcadia Bio Phos 80 has a capacity ranging from 80g/kg to 40g/kg PO4. This is dependent on water conditions. It is low dust and high density so as to ensure the very minimum of migration from the reactor to the aquarium. Directions: Because of the relatively small grain size, Bio-Phos 80 is best suited for use in a media reactor, or an area of high flow, in a fine mesh bag. The media is very hard and won’t break down like other Medias, allowing high rates of agitation to be applied. Dosage: Every 100g of Bio-Phos is capable of removing up to 4ppm of PO4 from 1000Ltrs of salt water or 4ppm PO4 from 2000Ltrs of fresh water. The Bio-Phos should be replaced when a noticeable increase in phosphates is indicated on a reliable phosphate test kit.The contents of this 250ml package will remove up to 4ppm of Phosphates from 4000ltrs of fresh water or 2000ltrs of salt water.