Zeolite types of media do an amazing job of getting rid of ammonia in your aquarium. Given that track record, why not use zeolite in your filter all the time? Although opinions vary, most agree that zeolite is great for emergency situations, but is generally not ideal for on-going long-term use.

What Is Zeolite?

Zeolites are highly absorbent porous minerals, composed largely of silica and aluminum. They are useful for their ability to capture and hold a variety of undesirable materials, much like a sponge absorbs water.

However, not all zeolite is created equal. How the zeolite was formed impacts it’s makeup, and consequently the applications for which it is best suited. Clinoptilolite, or Clino, is a naturally occurring form of zeolite that has a particularly high affinity for ammonia, making it a desirable media material. In addition to the various natural forms of zeolite, there are now artificially created forms of zeolite that differ from natural forms in their makeup.​

When choosing zeolite for your aquarium, select one that is labeled specifically for aquarium use. For instance, most cat litter contains zeolite. It’s not formulated for aquarium use, and it isn’t recommended. There is zeolite formulated specifically for freshwater aquariums, as well as for both freshwater and saltwater aquariums. Either formula is suitable for freshwater aquariums. There are also some formulas available that combine activated carbon and zeolite, a combination that is well suited to a newly set up aquarium that is experiencing a severe ammonia spike.