Buy zeolite for its many uses like a solar ice maker

The more generic form of this solar heat pumping process is used to produce ice. Ice that can be used to cool your drinks, keep your food cold, provide storage for vaccines, or even cool your home in areas where electricity isn't available. Many off grid applications exist for solar ice makers using the zeolite/water-vacuum process. A reservoir of water in an evacuated chamber is used to make the ice. This water reservoir is connected by a tube to another chamber containing Zeolite. Since this tube is also evacuated it contains water vapor. The chilling process is started by opening a valve so the water vapor flows to the Zeolite where it will be absorbed. As this happens, the Zeolite warms up, absorbing heat from the water reservoir as it does so. The reaction is sufficiently intense to cool the water in the reservoir enough so that it freezes. For each square meter of solar collecting area, these ice makers can generate over 10 lbs of ice. I am working on a homemade one to generate ice for my green RV living boondocking trips.

Zeolite is an effective ammonia filter when used in aquariums, but must be used with some care, especially with delicate tropical corals that are sensitive to water chemistry and temperature. Look for the special zeolite packaged just for this application. If you have a cat, you may already know about zeolite based cat litter. The benefit of zeolite in cat litter is increased absorption of liquid and ammonia odors. That cat litter may not be working as well as you like without some added zeolite.