Get adjusted levels of the foundation elements (Calcium, Magnesium, Carbonates) necessary for sustainable & accelerated coral growth with Red Sea Coral Pro Salt Ideal for reef aquariums and for growing coral frags Produces stable seawater with a pH of 8.2 – 8.5 No nitrates or phosphates (algae nutrients), no toxic levels of heavy metals & no chemical binders 22 kg bucket is for 660 liters water volume