The most common cation in waters potentially affecting human and animal health is ammonia, which can be removed by exchange with biologically acceptable cations that reside on the exchange sites of St. Cloud Zeolite, including K+, Mg2+, Ca2+, and Na+.

Because St. Cloud Zeolite has a high selectivity for ammonia in solution (converted to ammonium when it reacts with water), it may – depending on flow rates, zeolite volumes, and loading – reduce the ammonia content of wastewater by 95%, thereby reducing the release of excess levels of ammonium and inhibiting the growth of algae and the depletion of oxygen.

St. Cloud also produces an ammonia specific clinoptilolite that can remove ammonia even in the presence of high levels of calcium. This is helpful in lime treated effluent, and mine or other effluent naturally high in calcium.