Features: By firing processing of wheat stone, the ions discharge rate is dozens of times faster than raw stones, and the effect is more than 10 times. It absorbs and removes heavy metals, residual chlorine, ammonia, etc., and has a porous surface that is easy to breed bacteria, stabilizes water quality and keeps pH neutral. It quickly releases minerals in balance and supports the health of aquarium fish. It has good water permeability and is easy to maintain. How to Use: For both fresh and saltwater; Lightly rinse with water, and place it in a gusset net, use it as a filtration material for filters (top, exterior, outside, bottom, etc.) 0.5 - 1 L per 13.3 gal (0.5 - 1 L) of water. Many are no problem. Due to the circumstance of bacterial growth, it will be effective in 1 to 3 days when working in an aquarium, but it will take a little more time when launched. If dirt gets sticky, the effect will be reduced, and the water permeability may be poor due to clogging, so please wash it regularly. In addition, do not use this product at the same time with water changing. The effects of harmful substances and mineral leaching are usually last for 6 months or more. Grain Size: Approx. 0.1 inches (3 mm). Contents: 16.9 fl oz (500 ml). Raw Material: Chinese wheat stone, mineral. Note: Please remove this product when using a fish medicine. It may adsorb chemical ingredients. This is not a food product, so please be careful when storing it in order to avoid mistakes. If swallowed, it is harmless to the ingredients, but please follow the doctors directions.