ChemiZee is a highly porous zeolite pellet that allows water to pass through, where a chemical exchange takes place, and harmful ammonia is removed from the water, and stored within the zeolite itself instead. This should be replaced regularly to ensure the ammonia doesn't leach back out, we recommend every 6 - 8 weeks depending on your aquarium size and stocking levels.
The loose tub means that you can use as much or as little as you need, and it can be used with all types of filter, of any brand, as you just fill a media bag to suit the shape and size of the filter chamber you have. We would recommend to use a good quality filtration net bag for this product, such as the Swell Net Bag, available in three sizes, which you can find here. This means you can just take out and fill the bag, close it up, and install in your filter, and replace as needed.
This ChemiZee is a form of chemical filtration, and is suitable for freshwater use.