RowaPhos 1000ml Tub Will remove 3ppm of phosphate (PO4) from approximately: 8000lts – 1760 UK gallons – 2100 USG of fresh water. 4000lts – 880 UK gallons – 1050 USG of salt water. RowaPhos is a unique and patented, man made ferric hydroxide material chemically engineered for the efficient removal of phosphates, arsenic and silicates from fresh and salt water, having initially been developed in Germany for treating mains water supplies. RowaPhos has the largest absorption ability of any phosphate product worldwide and will not leach back in to the water. This saves the need for immediate removal once the media is exhausted. The product is easy to use and will improve the water quality wherever Phosphate or Silicate is a problem.