ReeFlowers Magnesium Blend is high-density ionic magnesium solution that assists in the structural development of corals oysters and similar aquarium inhabitants. Magnesium Blend contains a minimum of 100.000ppm of magnesium in each 1 litre bottle. Every aquarium has a different magnesium consumption level. Before using the product determine the magnesium concentration of your aquarium using an appropriate test kit. A maximum of 20ml of solution per 100 liters of water can be added daily until the optimum magnesium level is achieved (1ml of solution provides 1ppm increase in 100liters of water).Once the desired level is reached optimum consumption can be determined by means of periodical tests. Solution can then be added daily or weekly as required. If the daily consumption level exceeds 5ppm it is recommended that the solution be added continually via a dosing pump.