Red Sea's 5-star customer rated NO3 : PO4-X Nitrate & Phosphate Reducer is on sale today for as low as $5.99! Check out this video (4:49) then visit Marine Depot to learn more! PRODUCT DETAILS NO3 : PO4-X Contains a unique complex of carbons that are used by nutrient-reducing bacteria. Each carbon is utilized by different strains of microorganisms while maintaining the specific Carbon: Nitrogen: Phosphorus ratio required for each stage. The complex includes other organic bonded elements that are important stimulators in each stage of the reduction process. These metal and non-metals elements ensure steady bacterial propagation and complete nitrate reduction to nitrogen gas and the absorption and utilization of phosphate by the bacteria. The fine control of the nitrate and phosphate levels provided by monitored dosing of NO3 : PO4-X guarantees the gradual changes and accurate maintenance of the nutrient levels, preventing destruction of the zooxanthellae population that can cause UV shock and starvation of the corals. Unlike some other low-nutrient regimes, correct use of NO3 : PO4-X will maintain all of the beneficial micro fauna. NO3 : PO4-X is also recommended as a complete carbon source for use with carbon based de-nitrators. NO3 : PO4-X, available in 500ml and 1000ml bottles, also includes a measuring cup for easy dosing.