Feature: 1. The physical adsorption function can solve common water quality problems, and the effect can be seen in about 24 hours on average. 2. Excess nutrients in the aquarium will cause the algae to explode, but the decontamination pills can effectively prevent this situation. 3. It can be used for filter boxes, bottom filters, filter barrels, wall mounted filters, and other filtering device to place the mesh bag in the filter tank. 4. The reusable filter material is better to be cleaned with high solubility salt water once a month, so purchase 2 times to use alternately. 5. It can quickly remove the smell due to feed residues or filtration problems so as to prolong the water change time. Specification: Item Type: Fish Tank Filtration Pouch Material: Protein Cotton Dosage: 100g/0.2lb for tank within 30cm/11.8in 300g/0.7lb for tank of 40-60cm/15.7-23.6in 500g/1.1lb for tank of 80-100cm/31.5-39.4in 1000g/2.2lb for tank of 120-160cm/47.2-63in Protein Cotton Net Content: 500g/1.1lb Bactericidal Salt: 5. Package List: 1 x Bag of Cotton1 x Mesh Bag5 x Bactericidal Salt Note: Please don't let this product float in the tank, so as to avoid accidental eating by the beloved fish, please place it out of the reach of children to avoid accidental eating. (Keep the protein cotton particles moist and do not get dehydrated) This product cannot be used in aquariums that raise shrimps/crabs/snails.