A problem of many alternative heat energy systems utilizing non-zeolite heat storage media has been low efficiency and high cost. The highly selective cation exchange capacity makes zeolites especially beneficial in controlling specific cationic levels in water systems, agriculture and many other areas. ZS500RW is qualified for radioactive waste treatment for the removal of both Sr 90 and Ce 137 . As an example of selective cation removal, radioactive strontium can be removed from nuclear effluents by passing it through a zeolite filtration column. The efficiency of strontium removal is dependent upon many factors, including the relative concentrations of other competing cations in the effluent .
Sewage breaks down into ammonium.
This cation can be removed from secondarily treated waste water in much the same way as is strontium. ZS403H is a high crystallinity clinoptilolite also suitable for this application. When fish feed, their normal biological processes quickly contaminate the water in which they live with ammonium. Natural zeolites can be used to ensure removal of ammonium in fish farms, fish aquaria, and fish transport. Crop growers often use an ammonium based fertilizer to supply nitrogen as an essential nutrient.