After reading our section on FILTRATION, you've learned that an ideal filter is cultivated over time, and is not simply a matter of plugging your tank in.
However, you may already have a betta at home, whose water contains toxic ammonia, and who needs and immediate solution! Luckily for you and your fish, we have one.
WARNING - Do NOT use aquarium salt while using zeolite. Zeolite is "rechargeable" - when soaked in salt water, the zeolite will discharge the ammonia that it has absorbed (it can then be used again in a freshwater tank to remove more ammonia). Use in an aquarium with salt in it will be unsuccessful at best, and may add ammonia to the water at worst
Through a chemical reaction, zeolite absorbs ammonia from the water that is passed over it (by the filter). The zeolite traps and binds the ammonia, removing it from the water and keeping it out
However, zeolite removes ammonia quite slowly. For example, in a 5 gallon tank, it has taken my zeolite filter a day or two to bring relatively low ammonia levels (0.25PPM) to an absolute 0PPM
Zeolite has a finite capacity for ammonia. If large amounts of ammonia were being produced quickly (again MODERATE - HIGH bioload), the zeolite would quickly reach its capacity and stop removing ammonia from the water. It would need constant monitoring and replacement, and is not sufficient or economical.
For the above reasons, zeolite is not a solution for multiple fish, medium-large fish, or medium-large tanks. However, in small tanks with low bioloads, and LOTS of zeolite media, you can stay on top of ammonia!